Ash is super annoying to deal with. Her damage output is surprisingly high for a tank, but only at close range(unless they have slug shot). pick her off from a distance if at all possible. if not then wait for backup, you Will need it.
Run through "Siege Shield" to deny Ash’s zoning. When shield is behind you, its no longer useful for Ash & her team. Be careful and don't do that trick on low health - Ash might burst you down.
Ash's ult is powerfull and easy to counter(all cc abilities) but you also can make her not even use it, like hook with makoa , torvalds ult , Jennos grip, Shalin's and Cassie's rmb arrow can block her 'Ult jump' or move her ult to other place