do 25% bonus damage if you hit multiple times

agreed, it should be like graves buckshot because ashe sucks at farming lol.

I have no idea who is grave you speak of, my suggestion is original and creative.

When she ults it should do a volley like ice shattering thing behind the target where the arrow hits

Aw man, attacking targets should totally gain her some form of survivablilty. Like armour, or MR or something. That way it encourages active play, and not passive play like her current passive.