It's sickening when years go by and you find out that someone hasn't grown up at ALL, so you're fully in your rights to keep her out of your life.
She may one day quit making the same mistakes, but you and/or anyone else that have given her a chance to prove she wasn't a temptress (I call them holograms) certainly don't need to expand any time or effort on her. If she is to one day turn over a new leaf, she'll have to let someone new give her the benefit of the doubt. Getting back together with anyone she's used or faked "for old times sake" will be an even larger risk of her slipping into old habits.