I think it sounds like she enjoys you, but wants to keep it informal because she wants to have fun without responsibility. (You should be doing this, too.) Yes, this means you both are allowed to date other people so you aren't exclusive, but at least at this point she isn't freaked out about you moving in too fast, so you have a bit more time to make yourself irresistable.
Be hopeful, but don't invest allyour emotions into her.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?