Can my mother sue me?

Several years back my mother put inheritance money into my name from my grandfather, who ped away to "hold" for her and to "hide" from creditors. I purchased a home in my name only for myself and for my parents as they were having financial difficulties and had to sell their own home while it was in preforeclosure. It was a mistake. They never held up their end of the deal to pay rent in the amount of the mortgage (as we planned I would sell them the house in the amount of the remaining mortgage) once they got their finances straight). I was to pay the utilities. I was not in a position to do this but thought they would pay. They never did. I ended up using the money to pay the mortgage and expenses my salary would not cover. Eight months later my father left after being arrested three times. It has been about fourteen months since then, and my mother stayed. She has been a huge alcoholic the whole time, not working and drinking. Two months ago she aulted me and went to live in a private rehab facility for people with behavior problems. She has been charged with ault, and there will be a court case. Back in 2007 she signed a car over to me, and we sold it in November and received $12,000. Nothing was ever in writing, but she keeps asking me for "her" money even though everything has been in my name for at least 3-5 years. She said she is going to sue me. Now that the real estate market has changed, if I sell the house, I am not sure if I can sell it for what the mortgage due really is... Times are tough, and I still do not make enough money to cover the bills and so I have used some of the money that is left from the inheritance and car sale. About 13-14k is left. I pay whatever I cannot cover with the money, and I am trying not to run through it all. My job is in limbo----social services, budget cuts. I don't know where to move as a result and need to take care of some financial things on my end before I try to sell this house, which is a complete dump to be honest. I always thought I'd give her the money back if I could, and nothing has been in writing. Do you think she could sue me and win? I was using money for her to live here for two years. She also receives public aid, which she could not have gotten with having ets in her name. What do you all think. I will try to sell, once I am certain I have a job and can live somewhere decent.