This kind of thing truly saddens me when I think of how THC can literally be used for medicinal purposes and not because some lame teen is saying that to get it legalized. It's so sad =X. I wouldn't be dishonest to her, get as much information about it to her as you can, sit down and talk to her. Possibly get her to talk to her doctor, they're not going to tell anyone about what she says and who on god's green earth would arrest her for using it for this purpose.

Truly saddening.