She has a right to spend "her" money any way she wants to and she is under no obligation whatsoever to upgrade the place to your standards or your satisfaction. If she didn't have the money then, perhaps a relative died and left her money. Perhaps, one of her parents. Perhaps, one of more of her investments came due and she now has the money to "fix it up" and make it really nice. Perhaps, she won the lotto. Perhaps, she just turned of age to be able to collect ss. Perhaps she took out a loan, refinanced the loan or - any number of possibilities.
Certified Paralegal, with 25+ years' experience & with Landlord & Tenant law experience.