Could this be real??? vision problems?

So my sister is kind known for being full of crap. She started having some pain in her eyes a week ago. She went to the er and now she has been blindfolded for weeks. At first they said she had scratched corneas then it turned into iritus and now they say they see no signs of any of that and that it must be neurological. They cant find a reason. I dont think she wants to liven with her roomates and i am kinda apt to thinking she is doing this so my mom will let her move back in. If something is wrong with her I am gonna feel like a total *** but she lies so much I just dont know and no doctors can find anything wrong with her. Ughhh my gut says she is full of crap. My heart wants to beleive her.