She has a ~54% winrate, so yeah, she’s overtuned.
Avalanche is probably the biggest issue. It’s just such a strong ult, a massive displacement followed by a stun.
Other than that, it’s just like Hoku said, she’s just got a little too much of everything.
All of her abilities apply 2 types of CC if they hit you (blind+slow, slow+stun, slow+displacement), she’s got lots of sustain and damage reduction, she has lots of zoning/area denial, she’s got decent mobility, it just all adds up.