You can not and should not try to tell her , who she can or can not be friends with, that is none of your business, she can, and should have friends outside of you.
Some may be players, some may have hit on her before, if she turned them down, then that is her, that is also none of your business, if it is in the past.
I have no idea, who my wife dated before we got together, I never asked, nor do I want to know. I do not even know all of her friends, I trust her, and that is all that matters.
These are all your problems, and you are trying to blame or use her as an excuse. She is the one more perfect, and it is a surprise she will even stay with you.