If you didn't consent to having sex, then even if you were an adult it was rape. Would you want to ask her if she thinks that rape is okay?

Kids do experiment, but there is a line somewhere when it goes too far, or it isn't consentual for everyone involved, or someone is old enough to know better, or there is a power differential. Parents may have a hard time being objective about figuring out where that line is, and whether it has been crossed. There are a lot of emotions involved all around. But it doesn't make it okay what happened to you.

Danielle, therapy can help you to deal with the trauma, and also to decide how to deal with your family members. You mentioned a diagnosis, so I hope that it is being followed up with treatment. If you were traumatized, then you probably can't "just move on" without help. Your mom might not ever accept it though, and you are the only one who can decide whether you get any good out of talking about what happened with her. You might need to set a boundary and say that you don't want to hear about anything related from her, since her attitude hurts you. Or, then again, maybe you and she are ready now.

Whatever you do, I wish you peace and healing.
Rap