[taylalatbh.]

She's obviously in a very difficult situation and it's going to you hard for you and the family to try and make her see that. There's no way that you can physically force her to go and speak to someone about this (I don't think). But maybe you could speak to someone, and see if there is something they could advise you on, to help her? They would know a lot more about dealing with this, and what steps to take to help your sister. Speak to your doctor and tell them the situation. Let them know that you are entirely convinced that your sister has this condition, and that she has terrible mood swings and gets so bad that the police has to be called. Maybe then they can take further action into helping her.

Other than that, I'm not too sure on what can be done for her. I hope this helps, take care.