also, tell her parents right away. This is someting not to be take likely. You don't know if it's side effects, or possible early signs of a brain hemorrage.
This is serious and not for a forum,but she need to be taken to the doctor or emergency room immediately, because she's having trouble with her vision. It sounds like she is having severe side effect or bad reaction to the medication. I would stop the medication and contact the physician immediately....better yet, she needs to be taken to the emergency room immediately.