Mom has to take me to an ultrasound but refuses to bring baby father

I'm paying for gas because it's last minute and believe me I did not want to have to have her take me but our car is out of commission let's just say and it's been hell trying to get a new one. So anyways I had talked her last night about it because she wanted to go to the mall after my appointment, my fiance and I live in separate homes at the moment (waiting to here back on an apartment now!!! fingers crossed we get it!!) so I had asked her if we could bring him along since he didn't get to go to my first ultrasound and hasn't been able to go to any appointments yet either. now I didn't see why it would be an issue, I'm paying the gas money, and her to take us out there. She absolutely flipped out and told me "No I was never included in this plan I'm not picking him just to drag him around all day with us!" so I said, up"I will pay you extra gas money but this is his child too why does it have to be such an issue?" To which she screamed at me "Because I don't want too if he wants to go her can find his own damn ride and take you himself!!" She knows damn well she was a last resort to even go to this appointment, because of the way she acts towards me and my fiance and our pregnancy. I told her she was ridiculous and left it at that, but honestly it was a last straw for me, there's been several occasions where she has done something completely uncalled for or said something absolutely awful about my fiance and she even talks down on him to our two year old daughter, calls him a deadbeat, says he's abusive says he's not a good father and all he does is steals money from me. which None of these things are true, and she was the one who stole money from me and tried to pin it on him (have clear evidence to her stealing it and she still says he did it) so I have decided that she will no longer be apart of our lives, she will not see her grandchildren, she won't ever here from me again I am don't with her lies and her hateful words and when she tries to say I tore this family apart because I know she will will show her everything she does and said to make me cut her out and I will leave it at that because I am DONW with her.