If your income has decreased enough that you may now qualify for need based aid, most schools have an appeal form on the website and you fill it in and provide the documentation requested (loss of job, loss of a parent, disaster relief zone).
If you want them to consider an offer from another peer school, I’d call the school and ask what to do, who to send an email to, etc. You might also ask if there are other types of aid available that she could apply for - dept scholarships, talent, leadership, housing.