So we talked for the first time in months and. . .?

My birthmother messaged me the other day over myspace. Back in December she told me to not talk to her ever again so I blocked her on all levels. Phone, text, myspace, and so on as she did with me. I still talk to a few cousins of mine, and two aunts. I am guessing one of them mentioned my blood pressure was very high, and I could be induced. She made a new profile, and messaged me. She asked how I was and we started talking. I had seen her at a local pool about two weeks before messaging when I was picking up my husband, and I apologized for not speaking to her. She is on pills Very badly, and has a horrible temper. She is not one to be civil, she gets downright physical at the drop of a hat.I'm 9 months pregnant, I don't need cops or a physical altercation. She said she missed me, and went on this long boo hoo of how much damage I had done to my little brother because of her request to leave them alone. She wanted to know what she could do to fix our relationship in one sentance them yelled at me because she is my mother and I am cold and heartless ***** because I didn't speak to her at the pool. I sent her a very long message, telling her everything that was on my mind. How I had resentment twords her because she neglected me as a newborn (which she herself told me), and refused to work. I told her I would have to work on this on my own, and there was nothing she could do. I told her I didn't like how she would refer to herself as my mother, and my mom and dad as cindy and david, and how she kept saying they were nothing to me, and she was everything. I told her I was willing to give working things out with us one more chance, as long as she promised not to cuss or get personal (she has a history of calling me fat, ugly, heartless, told me I lied about a miscarriage, and so on). I told her I love her, and that I do miss the way she used to be 3 years ago, and that I do miss my little brother. I told her for once in my life, I wanted things on my terms, not hers, not my moms, and that she would have to respect the fact I'm in college, about to have a newborn, and a husband and they are my main focus. I was very civil, and she messaged me back cussing me out because at the age of 16 my little brother took my ipod from me and he heard a song that had the word ***** in it.he was 10. She told me I was going to be a horrible mother, I didn't deserve my son,that because of that incident I was irresponsible and that she was going to file custody for him, that her and my brother are suffering, and that I should be grateful she gave me up so I can have a husband and parents hand everything to me. (I'm on bedrest, hubby is having to do everything, and mom and dad help as much as they can). She keeps calling me spoiled, but she had no problems asking my mom for 2000+ dollar loan that she never paid back, or asking for stuff. She keeps telling me not to have anything to do with her or her family, that I am not her daughter, and she never loved me. She just messaged me and said she was sorry, but then started yelling about something that happened 3 years ago. She does this all the time, and can never take responsibility for anything. I know shell pull the same stuff again, but should I give her another chance? What should I do? She won't let me see my brother unless I come live with her and leave my husband and change my name back to the name I was born with, so she says. I just don't know what to do anymore. Please help me?