How long before asking her out on OkCupid?

detroit87
I found an online dating profile of a girl I knew in Law School and who I was friends with on FB. I talked to her maybe a couple times in school, we were more acquaintances than anything. Anyway, I sent her a message on the dating site because I always kind of had a crush on her. We have exchanged 4 messages each way so far tonight, I usually wait a little while to ask someone out on those sites, get to know them first, but since I already kind of know her I feel maybe I should ask her out sooner? Or at least ask for a phone # quicker? I have never done this with someone I knew before. Any suggestions?
How long before asking her out on OkCupid?
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