I am curious as to the context of her asking to have marks put on her. was she planning a scam? Did she say "i'm gonna cry rape. here! give me some marks to support my case"? dir she simply say "Make marks on me"? If the latter I'd recommend therapy.
Those comments could be taken a lot of ways. I think it's more likely she wanted to avoid a beatdown for not having the money. Or she could have just been so whacked out that she didn't even know what she was saying. I don't think the rape idea came to her until she was trying to get out of being committed. That probably came more from the power of suggestion at the hospital.