I'm trying out Ashe on this map, but its very different from SR.
You have to build more utility and health then AD(go with attack speed and blade of ruined king). Then have two tanky other champions and be the bait for your team. With your volley and your frost arrow to slow them you should be able to kite them back into your base, while your teamates finish them off 1 at a time.
Plus her hawkshot is like long range lantern for free, use it to make sure you are never ganked.
Weaker against burst assasins, but positioning is everything. If you go in first with ashe she will get focused so play smart, more like a "support".