Don't laugh but I need advice - girl advice

PM her. Ask her out to dinner...not lunch, not breakfast...dinner. Be direct, but don't be rude. Direct will let her know that you are interested more than just being a friend. Don't be too pushy. Ask her "would you like to go out to dinner next week?" or "can I call you? would like to catch up." blah, blah, yada, yada.

Keep it short at the beginning, until you actually see here face to face...then you're on your own...

good luck