Made things how they are?

A different day - a new rant.
So today I was talking to my mom about Bennett and the adoption and everything seemed to be going okay and she seemed to really be listening to me. I was telling her what I went through in the hospital when she said,

"Well when your sister and I went to the hospital to visit Bennett before you signed anything -" 

(which I had no idea they went to visit, I wasn't told or notified which bothers me but whatever, can't undo the past)

"Your sister and I went to take pictures and Liz was bitchy and told us that she didn't have to let us take pictures of him - so your sister said to her, 'Uhm, my sister hasn't signed anything yet so you can shut the fuck up'. - And we took pictures anyway, she went quiet real quick." 

Now, I don't know how true this is because my mom is known to make up stories to make me dislike people more. - Either way it still hurts.
I have so many thoughts about it.
On the one hand if it is true - then Liz was taking right over Bennett while he was still technically MINE and I hadn't even signed TPR yet and I didn't even though my mom and sister were there - nevermind the aparents. And that hurts. Also, if it's true then is that the reason she took Bennett and took off without contacting me again for months? Without letting me see Bennett again or letting his sister meet him? Did she do it to spite me because my family was snobby to her and went against her 'wishes'? Is that why she told me I wasn't needed anymore and didn't care for my feelings? Because of them?
On the next hand if it's not true - why would my mom want to hurt me more, knowing I'm already hurting? What is she accomplishing by trying to make me dislike Bennetts mom more? Does she not like her and wants me to feel that way too? I mean - I know, I know - this is my mom we're talking about. She's always been hurtful and I should be used to it by now. She sometimes just wants me to hurt so she makes shit up.
But we were having a good convo I thought and it really hurt.
Tom suggested that my mom was trying to relate to me with adoption and the only way she knew how to do that was showing distaste towards Bennett's amom. But I hate that. It's not her business. She didn't help me with anything. And in this case then what she said more than likely is true, which means it's her and my sisters fault Liz and I had a really rough start that I had to make up for in order to get anything of my own child. - It sucks in all ways.