Hugs

In my experience an alter acts this way when they are hurting badly and are not being listened to. Give her some time and space to express herself safely and then you will find out why she is hurting so much. Maybe she feels safe enough now to say what is going on for her. You could try listening to music that she likes or writing/drawing so that she will share with you what is going on. I hope you have a T to help you. Let us know how you are.