Print this out and hand it to your RA.
As for the toilet paper, take your roll with you and hide the paper in your closet. She’s not being very green when she goes through rolls quickly. You could buy rough, cheapie TP.
Post a schedule of cleaning. If she takes it down, make sure you’ve taken pictures beforehand.
You need to have a conversation, together with your RA present, about the lack of cleaning.
She obviously doesn’t have friends and tries to use yours. So, feel sorry for her, but that’s where it stops.
When your friends come over, close your door firmly by putting furniture in front of your door, or sit against the door. Don’t let her into your room. She’s going to have to talk to you through the door. I know it sounds harsh, but short of moving out, both of you need to work together.