She may not know better. It has been a while since she rushed and even though she has sorority friends they may not "talk sorority" all the time. I think honesty can be refreshing. We had a girl who ended up being a new member to us who kind of did the same thing. Besides, if you weren't the one she said it to, you don't know the tone of voice or context in which it was said. I wouldn't worry about it. Just decide if you like her as a person and if she has grades etc. I'd say go for it. It takes a pretty brave person to work hard for two years to get another chance at greek life. That may be a better way to judge. Good luck with recruitment!!!!!
Threaded Mode