I never really understood the point of other players being able to attack Abigail. What purpose does it serve other than abusing her shield mechanic? If that still works, that is.
I've seen it happen on public servers where other people will just start attacking Abigail for no reason at all. It makes sense for Wendy herself, as she can attack Abigail to skip the animation for unsummoning her which can be helpful in a pinch, but for other players to be able to attack her frankly baffles me.