Did you test her again CC team only?

I mean, she's meant to be very fragile but she's has, in my opinion, a crazy perma heal.

So, of course, if you manage to one shoot her (with Dunkhild for instance), she will be useless and out of the picture in seconds. Or maybe if you can land a heal debuff on her, that should have her killed too.

Otherwise, against CC team, well protected by Pyre + Flint or Lystia, she's able to last the whole fight and completely nullifies CC for 20 to 30 seconds.

Again, it's not that I disagree with you, it's just that I don't conclusive evidence yet.

PS: I also have 5 stars but I actually couldn't care less, I still have to finish my Doomia (red+5) and then, I have ten heroes waiting for red+5 upgrades