the baby mama

I met my bf baby mom a few weeks ago as she dropped off their child in the parking lot. Her fiancé was in the car and looked like he didn't want to be there. She walked out of the car in a rush and looked like a crackhead from how shaky she was. Also it was snowing outside and she was wearing a super short black romper with boots 😒
Her and my bf had a phone call in which he recorded and she called me a bitch because I did not acknowledge her. 
1) you were in such a rush that when ur child started crying u threw her on her father and rushed off 
2) if you want an introduction they why didn't u introduce yourself? U did say bye to me as u rushed off...
I'm so irritated bc I want to approach her next time and ask if she has a problem with me. She's 26 but acts like she's 16. Her tone over the phone was so superior. She said " I want that bitch to acknowledge that I am this child's fucking mother". Keep in mind she was never involved in the child's life until a few weeks ago. I've dated my bf for almost two years and have never seen her around. 
My bf said confronting her and asking what her problem is and that I don't appreciate her calling me a bitch behind my back and then actin like she's nice to my face is a bad idea for his custody battle and that she would probably try to hit me. I said that's fine bc then I can get a restraining order on her. I'm a bit hurt that he's ok allowing her to say that about me and that I'm not worth him paying her child support bc she dislikes me.