
Of course your mom will have another side to things, it's her view. She might also see your side of it, and still be in denial though. Just remember that you don't have to confront your mom in session, unless you want to and your and your T have discussed it ahead of time. Let her talk, your T wants to see if your mom has a legitimate viewpoint, or if she has issues. Your T is YOUR advocate, not your mom's. Please don't distrust your T, even after your mom is done talking to T. Your T has nothing personal involved in this, and wants to maybe also check out to see if T can work with your mom at all, to get through where you are (but I doubt T will try that this session, ok?) T needs information so as to know how to help you best.
I believe you. But say that, in the case of someone else ... that they aren't telling the truth in a situation like you are in ... they would still need T's help to be able to see the true situation, right? That's about the worst that can happen from that standpoint.
I doubt your T will upset the apple cart. Your T knows you need support and therapy, and even if your mom does too, still advocates for you. T won't want to tick mom off so she pulls you from therapy, remember.
AND after this session is over, remember that there might be after results. Maybe it will just be talk between your mom and you. That would be great, if T could bring that about, and prevent the abuse. However, your mom might tell you lies about what T said. Try not to react, because they might just be lies! Stay calm. If you have to give her a response use bland words and phrases like, I wasn't aware of that. I'll have to think about that. etc. Write down word for word any negative comment, so you can share it with T and further enhance the results of T's impression. Plus, if you can get it word for word, then you're sure of what you heard, and T can help explain what T really said!

Healing is difficult. It's nearly impossible when you live with the abuser. Stay strong. You won't always have to live under your mom's roof. You do need to become healthy enough to one day live on your own though.