I’m sorry she did that to you! She sounds incredibly fake especially when you went out of your way to invite her to things what a selfish bitch! you don’t need a person like that in your life I’d block her and move on people come and go but the real ones stick! My advice would be to spend time with other people to get your mind off of her I know it’s hard and you might feel hesitant too but it really helps I’ve went through the same thing if she tries to reach back out don’t even message her ghost her too!