What is the ideal gear and level for Nightsister Zombie?

I have her at 5* g8 level 80 with a set of one dot speed mods. Works perfectly for me and she wont take a fracture. I am 5 shards away from 6* but I dont think I am going to promote her ever.

EDIT: I dont run them in arena - just TB and TW, but they perform very well in both. People that run arena may have a different option, but I target NS teams with a high-health zombie.