What can I do if my mother is trying to file me on her taxes?

I am 21 years old and she does not take care of me what so ever! when I was under age there was a court order for her to keep me insured with health insurance which she cut off against the court order while I was still under age and she is supposed to help me with college according to the court order but she refuses. Now she is trying to file me as a dependent on her taxes to get money. I told her no but I believe she is still going to do it. is there a way for me to know if she did if she happens to do it? If she does, what can i do legally against her so that she can not have the money. I don't want the money but she is a horrible deadbeat and deserves NOTHING!!!