Sister is mad at me that she isn't getting my daughters baby

My sister has always wanted a baby and tried for 2 years then lost her ovaries to cancer. It was really hard for her and she was extremely depressed. My 18 year old daughter was raped 3 months ago and we went to court over it. She found out she's pregnant and idk the ins and outs of everything but my sister told her she would adopt her baby. My daughter spoke to me last week saying she never wanted to continue this pregnancy and she said my sister pressured her into it even though she kept saying she didn't want to. I told her I love her. I'm here for her. Whatever is less traumatic for her do that. So my daughter has decided to go with an abortion. She told my sister and my sister contacted me hysterical. She was angry at me even though I'm not apart of whatever deal she has with my daughter. She said it's her baby and my daughter can't kill her baby. I told her my daughter is 18. She can do what she wants and she's gonna do what is least traumatic for her. My sister cut all of us off and told my daughter she probably lied about being raped because she's ugly and nobody would want her because she's probably loose. My sister is 34. I get she's hurt but that is inexcusable. My daughter has her abortion today and my sister sent people to say awful things to her. I am trying to be there for my daughter. I have sympathy for my sister but this is too much