I'm really scared........?

My twin sister had a brain MRI yesterday because the left side of her face was impaired. Her left eye was swelling and half closed and she was having really bad headaches, so my mum took her to a Care Now and they sent her to an eye doctor who sent her to get an MRI. The tests came back negative for cancer, but they are still wondering about it. She is seeing numerous doctors today, but I still want to know if anyone has any other suggestions on what could be wrong... I'm really scared about it. We are 16 year old girls and models and I really don't want anything to happen to her. Can anyone help...? Thanks. x