Hello all,
TL;DR: Does it matter if the sponsor was unemployed before the current job, if the current job meets the financial requirement for Category A. That is, the current job (it's non-salaried) pays a little over 18.600 per year, and we weren't going to apply until we had at least 6 monthly payslips showing 1550+ per month. We have been told that because the sponsor was unemployed before this current job, they'll be using the Cateogry B method, and looking back 12 months from the date of application (and obviously we won't meet the requirement, as that would include 5 months of unemployment).
For all the juicy details..

-I am a US cit., met my lovely fiance in the US last summer. She was in the US visiting her sick father when we met, bittersweet circumstances.
-As her passport stamp to the US ran out, we decided we couldn't possibly be apart, and so I moved to the UK, and am now coming up on my last month of my own 6-month passport stamp.
-We started looking into a visa for me early on, and decided we definitely love each other enough to marry, and have indeed become engaged and have a wedding planned (already paid deposit) for early Feb. 2020.
-Before coming to the US, my fiance had been a university student in Nursing. When she found out how gravely ill her father was, she left her nursing program (putting it on a 1-year hiatus) and came to the states (and of course, did not work in the states).
-Upon coming back to the UK, we coasted on a little support from her mum, some of my money, and some shifts at a previous employer, filling in gaps in their schedules (being paid at an hourly rate).
-To earn enough to qualify as my sponsor, my fiance had been counting on working "bank" shifts for the NHS, picking her own hours, and being paid hourly.
Now, the first solicitor we visited, in Feb 2019, said that these NHS bank-shifts wouldn't do, because the employer wouldn't be able to truthfully write a letter stating that my fiance would be bringing in x-amount, as it is variable and entirely up to my fiance to schedule enough hours to meet the income requirement. So for example, in the months leading up to the application, she could book enough hours for herself to meet the threshold, and after the application, completely slack off and then earn say well below the amount. So it was suggested this wouldn't do - she needed to be employed on a contractual basis, with a guaranteed number of hours. This lawyer also said that the monthly income needed to be 1550 or more, and not a cent less. She suggested that if we had 6 payslips, each one 1550 or more, that would be enough. So we (myself, my fiance, and the solicitor) decided that my fiance would find some contractual work that would pay at least 1550 per month, and then when she had 6 consecutive payslips with at least that amount on them, we would go back to that solicitor and the solicitor would build our application (of course we'd be collecting supporting docs leading up to that meeting).
Indeed on March 4 my fiance got a job paying slightly over the 18,600 annual amount. She is paid per hour worked, and has been paid:
1518 in March
1560 in months April - June
and will be paid at least as much in the following months
As it is drawing near my date of departure due to the stamp running out (Aug 8 I leave, 4 days before the stamp expires) and also we planned on applying not so long after (once my fiance has 6+ payslips meeting the requirement), we have really started contacting solicitors again (getting second-opinions, the first solicitor actually seemed very unsure about some things and a little disorganized, which was a put-off)
The first solicitor I called said that the home office would be checking that my fiance was currently earning a rate above 18.600/year, and would also check the 12 months prior to the application date to see that in that time, 18,600 had been earned.
This obviously won't do, as from October-February my fiance was unemployed, and for the year preceding, had been a student.
Now this put us in a panic, and I have read the Appendix FM SE high and low, as well as many posts that I could find, and it sounded like this solicitor was confused, thinking that my fiance will have been with her employer less than 6 months at the time of application, and that consequently, we would be using Category B, as opposed to Category A.
So I contacted another solicitor, and after a very annoying back and forth, talking to a secretary who kept having to leave the phone to ask someone who could actually answer questions, I was told a similar story, with the added detail that it is because my fiance was unemployed prior to this current job. Namely, that despite the fact that we wouldn't apply until we met the Category A requirement (that is, using the Category A non-salaried calculation method, where her gross income of 6 months of payslips is divided by 6, and multiplied by 12), because she was unemployed before the months of payslips that we will submit, the decision-makers would be counting back 12 months from the date of application, as though we were using Category B.
Now, we were NOT going to use Category B, because we aren't applying before she has been with the same employer at least 6 months.
The implication is, that despite only 6 months of payslips being evaluated for Category A, that the Home Office will use the method from Category B, on the basis that prior to her current employer, she was unemployed.
But this seems ludicrous, as nowhere is specified (that I saw...) such a thing, and further, why would it be different because she was unemployed before her current job? She could have been employed, but at a much lower rate previous to the current job, and as far as I can see, it wouldn't matter, as long as the job she has held for at least 6 months pays above the specified rate.
So...is there some huge, painful detail that I'm missing, or are these solicitors really misunderstanding something?
HELP!

Thank you!