This is long, sorry, don't read it if you don't want to, but here's my personal take on the matter: I for one think her eyes are rad and like the heterochromia representation. Complete heterochromia is really rare, but still exists, and I myself have central heterochromia. It's often associated with developmental problems, injury, trauma, and a slew of diseases. It can be benign, but for her, I think there's a good chance it's linked to her muteness, hair colour and maybe other abnormalities too. (For example, Waardenburg Syndrome can cause hearing loss and change in hair, skin, and eye pigmentation.) I can't disclaim OCD being triggered by it, you're valid, but to answer the "why": that's just how people are, and it adds to her character and possible backstory nuance. She's gone through enough, she doesn't need slander for it; there are reasons people try to hide it haha.
