Make the witch scared of you!

The rare sight of a witch being scared by Survivors!

Basically if the witch hasn't noticed any of the 4 yet and is happily err sadly? crying away, dont aim at her but get all 4 close to her as possible without her noticing you then all 4 of you start shooting and it should alarm her and make her run away from you! DONT SHOOT AT HER THOUGH!
I did it on Dead Air campaign, just before the crane when your inside the building. She was in a room with the door closed (this meant she couldnt see us) we opened it and started shooting and she crapped herself and put her hands over her head and ran away!

See she isnt so scary after all ;)
Or if you just want to get rid of her, shotgun run up to her and shoot her in the face! :)