Well you can't just expect to be her BFF, waiting in the wings until she comes back around so that you can pounce. Move on. Find somebody else. She's only going to find someone else too, you're going to be the third wheel and it'll be awkward.
I think with time, you should be able to have normal conversations, and get along, sure. It's just a mature thing to do to be able to rise above it, brush it off, and just be an interested person to talk to. But one, the fact that you've made this thread makes it clear that being rejected hit you hard, and two, you can't really expect to be really close friends any more. Give each other space (no incessant small-talk text messaging).