Text should be made for little comments or observations, not conversations or making plans. That’s what the phone is for. I know, no body really calls each other anymore. But do you WANT to be like everyone else? No. You want to stand out and demonstrate your leadership. After you get her number you can text things like “Was great to meet you! **make a comment on something you spoke about**” That way, you’ve established contact and said something positive. For clues on romantically, if she touches you, plays with her hair, crosses her legs towards you, they are all signs of interest.