Hello,
I am sorry to hear about this - very unfortunate.
Has she sat down and explained the position in detail with the employer, pointed out that she has financial commitments and came to work with them in good faith etc. Then ask them directly if they will make some form of "ex gratia" payment to her, to help compensate her and help her financially while she looks for another job ?
Absolutely nothing to lose and if they are reasonable people, the might do something to help (even if they honestly cannot afford to do much). They may also be able to help out with some costs (i.e. phone or broadband bills, education and training costs etc.) , which they might be able to absorb through their business tax efficiently, while she is still staff.
Obviously, she should also ask for some paid time off before she finishes up, to go to speak with career advisors, recruitment agencies and hopefully interviews.