Ashe is balanced.

Having a massive DPS steroids on Q by giving both high AS and AD bonus while also having +10% AD bonus from your passive (like corki, but not true damage) with an other passive (2 passives, so fun ) that perma freezes (so you can self peel with your above average range) is definitely fine on a champ who is defined by her utility.

Her ult is a game changer late game, so it only makes sense to make Ashe one of the strongest early and mid ADCs right?

Her winrate is currently a mere 53% on champion.gg, but I assure you that it'll rise to +56% with these stats she currently has as people will learn how to play her correctly, just like Jinx rose from 51% to 55% without any buffs. Jinx is getting nerfed next patch, which will only increase the Ashe's power. Her winrate is currently held down by the bunch of new people that are picking her up (popularity rose from 7% to a stable 25%). Most of these people don't know how to play her yet. But as soon as pros will show the sheep how to do it, everyone will be climbing freelo with her.

But I don't mind... I just know who to pick for freelo now. I've used tristana before people were complaining about her (she was OP long before the complains), and jinx ever since the tristana nerfs. So I'll be playing Ashe until she gets permabanned/gutted now I guess.