So let me get this straight.. You've met her ONCE and you declare each other bf/gf. Uhm... you're moving way to fast here. I think you should ask her if you're exclusive first off and second off you need to dial it back a bit. I'd NEVER tell someone that I'd be their gf after one bloody date. You don't even know each other in the foggiest.
First find out if you're dating exclusively and then if she says "yes" then ask her why she still has her dating profile as active. Keep in mind that one date and a few emails and text messages does not a relationship make.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion