Only things I think ashe really needs are a new passive and a new E.
Her passive is really only strong when she first comes into lane. This guaranteed crit will probably get used on a minion and from this point on she essentially has no passive because (1) she is always auto attacking, and (2) even if she wasn't, the crit chance stacks to slowly to ever get it to a reasonable amount. She even loses her passive charge when attacking towers, something renekton and tryndamere don't even suffer from. I am a strong advocate of the popular choice of keeping the crit percent chance stacking until she crits. she will get them in lane it late game it will mean she is a little more consistent with her crits.
Her E needs something else entirely. Lets start with the passive. extra free gold is nice, but considering you will be getting one extra gold because this ability is always maxed last, its really not helpful. Not to mention the only thing additional levels of the ability gives is more gold; no cooldown reduction or other effect for the active that i will now talk about. The people arguing to leave her E as is say "its free vision so its fine" Well, congrats, ashe, a carry, has a clarvoyence with limited range. This ability has few uses; getting vision on champions that are running away from her as she attempts to chase them down and checking objectives. But it is not useful for avoiding ganks and does not help her stay alive or kill an opponent faster.
I don't actually want to give her an escape, I feel like that would take her away from her character too much. I would love to see her get a passive that is useful more than just the start of every team fight and coming back into lane. And more importantly, I would like to see her get an actual ability on her E