Worried about a mentally and autistic friend (disturbing story)

Mandi • I’m a fashionable, artistic, nerd 😉
Sorry if this is long and disturbing it's very hard believe but this what my friend was telling me about this guy and what she would do to get good grades in college 😖
So honestly I very worried about friend she's not mentally stable and she's also has autism anyways my friend told me she's meeting up with a guy she met off a dating site from what she told me the guy makes fun of her, her friends and family and also this creep asked her for sexual favours I told her many times do not meet up with this man and she refuses to listen not only me but her other friends and her parents too now the really disturbing part is that she is really considering allowing his guy to do sexual stuff to get this guy to continue to help her with math and other subjects in college 😖😖😖 and she told me she doesn't care how low she steps she really wants a good grade in her subjects even if she lets this guy do sexual stuff for her! That's pretty much prostituting her self except not for money or anything of value she's prostituting herself her good grades in school! How can I get her some serious help she don't listen to me or anyone and she honestly thinks cuz this guy is nice her sometimes she thinks okay meet up with him and he's pretty showing all of the warning signs for an abusive boyfriend and maybe even rapist the guy looks sketchy and creepy