Hello and welcome to the forums!
I'm also new here, so I'll try and give you some of my thoughts (more experienced people, feedback is most welcome!)
So this girl friendzones you and you move on- GOOD!
How long have you been talking to her online and on the phone before you actually mentioned dating?
Maybe you've come on a bit too strong too quickly, maybe the girl has recently ended a relationship and is not yet feeling too confortable in advancing so much so quickly. Talking on the internet is a bit harder since you don't have the actual vision of her actions and expressions.
Try not coming on too strong again, first ask her to go down for a cup of coffee or the park or something, just so you two can actually meet. Keep it light and funny, make her feel confortable and dig in to her likings/hobbies and build up something from there carefully watching her body language to determine how she responds.
Hope I helped and for the experienced people evaluating, hope I didn't mess up
