"Hey, it's been a while, how are you doing lately?" When she answers you then proceed,
"Oh yeah? Have you seen anyone during all that time?" And the reason I put that there, is because she is probably going to give you something like, "Oh I have been really busy, going to school working blah blah blah." Something along those lines. You just have to ask, it's really a natural flow when you start with the first.