does the letter from her employer have to be dated on the 28th or later since this is when she will have received her most recent payslip? Could the letter from her employer be written before she receives the most recent payslip (like a week or two before she gets her most recent payslip, she would have 7 months pay at that time and due to Feb being short we needed to wait until the March pay)?
The letter is separate from the payslips and can be dated at any time in the 28 days before applying for the visa.
However, what format are her payslips issued? Are they issued as formal, paper payslips and handed/posted to here, or are they electronic payslips that she prints herself?
If it's the former, then you just need the physical payslips, but if she prints them herself, then they must be accompanied by a letter from her employer confirming authenticity.
So, it depends whether you need a letter of authenticity as well as the normal letter from the employer (which can be combined within the same letter), or if you only need the normal letter from the employer?
The options therefore are:
Formal printed payslips:
- employer letter containing all of the above, dated any time within the 28 days of applying for the visa
Printed electronic payslips:
- employer letter stating all of the above AND confirming authenticity of the payslips, dated on or after 28th March
OR
- employer letter containing all of the above, dated any time within the 28 days of applying for the visa
AND
- letter of authenticity for the payslips dated on or after 28th March
Also, does her bank statement have to be for the entire month of March (1st - 31st) or does it just have to cover up to when her payslip was deposited (likely 28 March)?
Both the payslips and the bank statements have to cover the full 6 months you are using to meet the visa requirements, and not a day less.
So, if her latest payslip is March 28th, then the 6 months will be 28th September to 28th March... so the latest bank statement can be dated 28th March as well.