Kill Viper Boss A3 Normal For me

Hello Before you judge me on this the reason why i am asking for help is because i run a stun knockback warrior build and this viper person keeps getting stuck in her soldiers and keeps bugging out. So i literally cant kill this boss using my build as i have tried my best ot not knock her so muchback but for me to do my damage it just happens .... Anyways if you want to post your Name to help me that would be great im so sad i am realy enjoying myself