The way you describe this makes it seem like you are afraid and that is not okay. Please think about yourself, your safety, and well being. Are you keeping a record of what this friend is saying, doing, and showing you? If it gets so bad then this record is important in showing that this has been happening for some time.

Talk about this with your therapist. I do not know your age, but if you are an adult then you are the one who decides whether or not your parents are in the loop. A good therapist is on your side and will hopefully have more ideas to keep you safe and happy.

But please please please. If you are not feeling safe, do not stay in the situation. You are the most important person in your friendships. If you need to leave a situation, you leave. Tell this friend that you do not like it when they call you, "she" and if this friend continues to do so, they are not a good friend.

Talk to your therapist, be open to communication, and please keep yourself safe.