Though of course it is related, her working status is a bit off the topic from my latest update and question.
Are you referring to this? (From the Citizens Advice Bureau regarding EEA citizens)
If you're working in the UK you don't have to satisfy the conditions of the HRT. However you'll need to show that the job you're doing is 'genuine and effective' and not 'marginal or ancillary'. There is no clear definition of what this means, but if it's a real and necessary job that an employer would pay you to do, it should be classed as work. It can be full or part time. However, from 1 March 2014, you will be asked to show that for the three months before your benefit claim your gross earnings from your work have been at least at the level at which employees start paying national insurance contributions (£153 from 7 April 2014). If your earnings have reached this level you will automatically be regarded as a worker. If your earnings are below this 'minimum earnings threshold' you may still be considered a worker but you will be assessed against a wider range of criteria, for example, how much you earn, how many hours you work and whether your work is regular or intermittent.
Any other income threshold is not related to fellow EEA/EU citizens. Unless you have some other sources of course.
The UK brought in new rules for workers (PAYE) and self employed workers for benefits (at first). Both have to meet the MET. The self employed person now has to register with HMRC too (I can't rememebr all they have to do to be classed as SE).
Now those trying for PR in the UK are reporting they are have been refused PR as they, the EEA citizen (or their EEA citizen) was not earning the MET and therefore they were not a worker qualified person during that time.
The rules for Self Sufficient changed too as they use to claim their non-EU working was how they were self sufficient. Now all the family of a self sufficient need to have comprehensive sickness insurance, and they must show the savings they had to prove they are as a self sufficient. If they can't show those savings then their non-EU family member had no right to work as they, the EEA citizen, was not exercising treaty rights (and therefore they can't use those wages of the non-EEA to show they were self sufficient as they were not meant to be working). If they claimed UK benefits, even only for their children, then they were not a self sufficient as they needed the UK to keep them.
Using this MET seems to mean that those who are Student qualiifed persons can't avoid buying comrehensive sickeness policies for all their family members by doing just a few hours work a week and claiming they are a worker. More to the point, without that CSI for all their family, they are not exercising treaty rights of free movement in the UK.