>>25839
>she acted nice with nice people
>she acted evil with evil people

It's called "mirroring" and it's a typical BPD trait. BPD girls have an unstable self-image. They tend to change their views and values to match the people around them in order to endear themselves to them and it's obviously a form of manipulation.

If you happen to meet a girl who claims to have a "sponge" personality, run.