There are plenty of responses from both me and Kaz (primarily Kaz) in another thread on that subject.
It would be much harder for me to get that kind of info right now, so that's not something I can answer at this time (I also don't know if I have that level of detail I can dredge up without getting a query from a programmer, and those guys are super busy right now).
Still, if the top players who user her have the best win rates, they'd have to have like.... 6x better win rates than everyone else in the leaderboard that uses her consider how low her average defense win rate is, which seems really unlikely. We know people who are at the absolute top of the leaderboard can only be there with good hold rates, but I while she can be great in the right hands with the right Talismans, I doubt there's that much of a discrepancy.
We're going to keep an eye on her, but there's already some bug fixes we know we're shipping with the next update that mitigate some of her power (certain passives being flagged wrong, allowing her to stun more often), and there's other bug fixes we're needing to investigate too. In addition, there's other things that'll be released soon that will also speak to countering some of what she does...