WARNING! WARNING! DANGER, HIUSHI! DANGER!

Proceed at your own risk, but pursuit of any kind would be very, very risky. AND THAT INCLUDES FRIENDING HER ON FACEBOOK!

I don't know where you are, but in the US, this is extremely unethical - and possibly ILLEGAL!- and would put you and your employer at risk. I have been a manager for 25+ years, have been involved in the hiring and firing process for at least that long and have faced situations like this on more than one occassion. I have had to fire good employees for making this mistake and have seen the company I worked for involved in a lawsuit because an employee thought it was "OK" to take her number from her resume. So, if you think risking it is worth losing your job over, ask yourself if it's worth taking the company down for as well.

If you're not sure, ask your HR department; but realize that may have implications as they would surely worry about your judgement. We have this conversation before EVERY interview we conduct.

Could it work out? Sure. I could also jump out of an airplane without a parachute and survive. It's happened. But it ain't worth the risk.

If you're still willing to take the chance after all the advice to the contrary, then you didn't need the advice anyway.