How do I help?

Hailey
So my younger sister is experiencing a miscarriage. I am tryimg to support her the best I can and make her as comfortable as possible but I don't understand whhat she is going through, so it's hard for me to know what I am doing. I did not grow up with her, as my mother gave her up for adoption 22 years ago, and she found us a few years ago. She left her life and her parents beind her and moved in with me and my husband (who are ttc) almost 2 months ago. Shortly after found out she was pregnant with a man she met at my wedding and being unsupportive. Her adoptive parents told her they think she is lying and got an abortion and told her to get over it. My heart absolutely broke for her because all she wants is to be held by her mom, and her mom doesn't even care. My mom has been over all day, trying to comfort her as much as possible too, but she is obviously still hurting. I just wish there was something else I could do to help her. Any advice?