I think this is quite convicing proof.
The dark side made Kreia look different to her, and the fact Kae and Kreia were exiled and so on so forth, is pretty interesting.
Though it is strange how Handmaiden and Kreia never reacted to it. Kreia might be manipultive and had her features corrupted by the darkside, but a daughter would always know thier mother.
"If God is a DJ, then life is a dance floor, love is the rhythm and you are the music."