You know, I wonder if she has any ugly jealousy going on deep within her soul, like so repressed she doesn't know it exists, given she was a bit of a loner and did have some envy over others making friends back then, y'know to make things a little interesting.
But I wouldn't be surprised if she doesn't have that given how bland and pure she is, imo.
Then again, it would prove snake girl's philosophy, but even then it's unrealistic to assume that everyone is bad if they happen to have some darkness within. Tricky stuff.