@PAPALOTAPUSS,
You need to move on from this.
You know she's a liar because she either lied to you or to her friend. She may be a cheater as well.
There's nothing to be gained here - you're just going to find out one bad thing or another. It's just bad any way you look at it.
Write it up as a lesson learned.
I'm not going to say meeting people online is bad because I met my partner in the predecessor of Able2know - another site where people discussed religion and politics and art and stuff. But ... take your time and if possible, do try to expand your local circle and hopefully you will meet some genuine, kind and honest people that way.