I know I'm really late replying but you need to be a bit firm with her and tell her like it is. If she's so focused on finding a man sometimes using the logic "men won't like you this way" actually works, even though it's not what we'd consider the best advice or nicest thing to say.

I have a friend that was EXACTLY like you described. She was a pretty/ cute girl but was got totally obsessed with men to the point she came off as a loser and a creep. She'd stalk this guy in the local clubs, follow him home. She even slept with him and would leave things at his place and find excuses to go back. I mean she just wouldn't quit.

It got to the point where I had to tell her how she was coming across. I used words like "desperate" and other nasty things that I wouldn't want to call my friend, because she is a lovely person despite all that. It worked and she eventually came to her senses.

You need to tell her how she looks to these men she's throwing herself at, because at the end of the day, it seems like it's their opinion of her that she holds above all others, so telling her what you think of her might not have as much effect.