I met my SO on line also, he didn't tell me right away but about our 3rd or 4 th time together he did. I've been with him about 10 months now. I would first see if there is some kind of connection before saying anything. But before you throw your heart out there and end up getting it broken, I would say something. She might be like me, she may just want to find out more about you, because she feels a possible connection there as well. Being open and honest is a great thing, I'm not sure yet about all facets of his dressing I'm totally comfortable with, but then again I'm middle aged and that just might make a difference.
Sometimes we just have to take a leap of faith, anyway that's my :2c:
wish you the best