Have you talked with Brandeis admissions and financial aid regarding a financial aid and/or merit pre-read? It is a tough and vulnerable position to be in, knowing that your D will get merit at Muhlenberg but not knowing net COA at Brandeis.
Consider reaching out to the Dean of Admissions and Financial Aid (Jennifer Walker) https://www.brandeis.edu/admissions/about/staff.html Really, it is their job to help families work thru these issues.
Good luck.