Wow that doesn't look good.
But I think you're right, it doesn't look like mold.
It does look like something has certainly contaminated the culture.
Maybe something got under your cap or maybe your hand washing procedure before handling the mother wasn't good.
I just commented in another thread a moment ago where someone had green stuff growing in their batch that looks like algae; I think yours looks like that too. I'm not confirming that's what it is, that's just what it looks like to me. The way it has greened your edges and has grown on the side of the jar.
Maybe it's fine, but if that was one of mine, I'd toss it and start over.
Where did you get your mother from? If from a reputable online grower, they may have a support system where you can get an opinion if you send them your photos.
Check this page out, your situation doesn't look like any of these:
Do you or anyone else smoke or use any nicotine containing substances in the room where the ferment is kept? Nicotine is poisonous.