Tell her to talk with the landlord. She needs to ask if she can find someone sooner to rent her room or they find someone sooner to rent the room would she be held to the 90 days. I say this after my experience with breaking a lease. One bedroom apartment in DC. Rent was cheap and it was cleaner than when I moved in. I gave them 30 days notice and they were able to find someone to rent it so I only wound up paying for a week while it was being turned over.