Well you don't have to be making a lot of money to get a work permit- you have to be more qualified than anyone in the UK or EU for the position however (which I imagine there are plenty of paralegals over here-or paralegal type roles)
However, there is something called HSMP (highly skilled migrant programme) or Tier 1 I think its called now, where based upon age, degree, qualifications, potential for money earned based off past earnings, you get so many points- if you have enough points (and enough proof that you actually meet them) then you can come here and work.
However, if she is wanting to go back to school, she may want to check out programs here in the UK and she may be better off on a student visa (but the downside is that she'll be paying international student rates, which are very expensive)