Welcome to Gaia! ::

Its always good to let your friends know of what you think of them, wether good or bad so they know that they can trust you to be honest. If you are really good friends with her and you talked to her about this it might be either weird or you guys just might find yourselves on the same page. First as a friend ask her about the guy she met at the con and see if they are still going out or doing stuff. Then if she says no then there is your chance. Ask her if she wants to "hag out" somewhere. Then talk about this but dont tell her how you feel first ask her how she feels about you in an honest way. See if she really only finds you as a friend. Then you can decide if you want to tell her how you feel.

Hope this helps! Have anymore questions you can ask me. I had this happen to me to as the girls perspective. There was this one guy in high school who I liked as a friend and nothing more. He actually told me he had a crush on me while I was already dating someone else. It was a bit weird and shocking but it also Flattered me. when my ex b/f and I broke up I was hoping to hook up with him but then found out he was dating someone already. yeah it sucked. So dont wait it out for long time unless she is dating the other guy.

Then a few years ago at work I met my future boyfriend. He just asked me if I wanted to "hang out" sometime after we have been working together for a couple months and have been friends. And in terms in "hang out" he meant go out on a date. On the date He told me how he felt and I was even more flattered and I told him I felt the same way too and then from then on we have been together.

Good luck heart

Err..
Coming from a chick's perspectiveeee....
If you've made it to the friendzone and you've been there for awhile.
Especially if you two went to a con together and she got a dude's number.
I'd say..sadly..that you may not have a chance.
I'd go on and tell her how you feel, no sense in keeping emotions bottled up for later explosions.