I know exactly how you feel.
a male friend who did this EXACT SAME THING TO ME last year. He went out of town with a bunch of people for his birthday. I was originally invited, but ended up not being able to go...and for some unkown reason, he decided to lie and say that they never went...and then pictures were posted on facebook and etc, etc. It was the most random, unecessary lie ever told.
Friends don't lie to you, especially about things like this. And once they do and you KNOW about it, it's really hard to move past it or let it go. When I confronted my friend about his tall tale, he brushed it off (sort of admitting it, but acting like it really wasn't a big deal). I still don't understand why he lied. It made me feel foolish and like the joke was on me and it really damaged our friendship. We are no longer friends now and it's for the best.
Toxic people need to be shown the door. You know your standards for friendships and she is not meeting them...you have to make the decision from there.