my ex-wife and I divorced, she signed a quit claim deed but she forgot to p

my ex-wife and I divorced, she signed a quit claim deed but she forgot to put her name off of the mortgage. So, her lawyer sent me a letter stating I was responsible that I am supposed to assume the debt and I am because I have made all payments since we divorced in 2007. I am considering refinancing but I might not qualify and I am short on money to do an inspection, refinance, etc. So, does she have any power over me or can I just stand my ground? What can she do by the court to force me to sell, take her name off, etc.?

Thanks