What rights do I have to see my girlfriend in the hospital if her family disallows it?

Hi. I want to see my girlfriend but her parents are really upset and don't want me to. She lives at home with the during her college and I work at Petsmart. The other night we wanted to do and thought to try doing it differently and trying . We thought hand sanitizer would be a good lubricant cause its a gel and also be very clean since, well, there can be some grime involved in we thought even though we hadn't done it before. A little bit into she started getting really sick and threw up all over and started to shake a bit and I didn't know if she was just having an extreme orgazm until I saw her vomit and I knew it was bad news. I called the hospital cause she had her eyes rolled up and was shaking a lot! The ambulance came and took care of her and her parents were there for the whole thing. They told me to leave (actually, her dad said f-off!) and they wont let me see her and i am very worried because i love her and dont want her to be so sick or anything. Her sister told me she is much better now but they want her to stay there until this afternoon so the doctor can see her again. Her parents have disallowed me to visit her any more and wont let me in the house. I am so worried. All I got was a text from her that said ":(".