How can I stop this girl from sabotaging my career?

A lot of this is none of your damned business.

This girl is simply using the resources of the University to her best advantage. Which I imagine you or anyone else would, if you could. Do your professors believe her? Well, they aren't professors for nothing. They might actually, you know, have brains. If you have concrete proof of cheating and plagiarism, then of course bring to the professors' (and dean's) attention. If not, then it's just rumors.

As for her friendship with this man, who the hell cares? Are you jealous? Are you interested in her? If not, then butt out. And, hell, even if you are, butt out. People are allowed to have relationships, yanno.

As for her trying to take your "jobs", that's pretty amusing, seeing as she most likely can't hold down more than one job at a time. I think you mean that she's trying to get you all fired. Well, talk to your boss, not us! And have documentation. Again, you need proof - otherwise it's just nasty rumors. Perhaps this girl is innocent.

As for her being cheap, again, none of your damned business. If your friend wants to pick her up, then he'll do so. If not, he won't. If he wants to invite her, he will. If not, he won't. I fail to see where you are involved in any of that nonsense. As for her asking for a ride, well, you have no idea whatsoever of her life, now, do ya? Maybe she's poor. Maybe she has bad night vision and can't drive. Maybe she's a mutant zombie looking to eat the brains of your friend.

So much drama, so little of the business is your own. Are you this bored and unchallenged in your life that you need to gossip about this woman anonymously online?

What Jespah says - most of it is none of your business (she's got a muslim man doing stuff for her - that's not at all anything to do with you)

And she isn't ruining your career - that's pure theatre on your part...what, are you saying she can somehow wreck the results of your work?

And you gave her information - which was your choice, and you are upset that you are a bad judge of character? Why did you give her the information in the first place - to show off, try and curry favour with her, or in the hope it might lead to her hopping into bed with you?

Seriously, grow up.

You can't change other people, you can only change yourself. You sound paranoid, bigoted, insecure and not someone who I would want to be friends with. Instead of criticizing another person start by fixing yourself.