I don't think you did it. I think she did. Why would she keep pushing the dates back over and over again? Either she was afraid, or she was a fake. One of the two.
Perhaps she described herself to you one way, and she's exactly the other. She doesn't want you to see her.

Maybe she told you she was a svelte, gorgeous girl when in truth she's a fat, unattractive girl. Who knows? LOL Or perhaps she's even married! Or maybe it's a guy! LOL
You know, all kinds of weird things go on, on the internet. You just never know. Horrid, nasty jokes are played. And people make themselves out to be one way, when they're exactly another.
It wasn't you. It was her. I wouldn't feel badly about this. You just never know what goes on out there. God bless. Hugs, Lee