Are the animals in cages? What does my friend know about the animals?
If the friend just went and picked them up (from their cage) without permission and knowing the dangers of this man mauling leopard gecko and ball python, then no they shouldn't be able to sue me. Its their choice to pick up the ball python and leopard gecko. If the friend isn't aware that the animals are dangerous then i would say its their responsibility to find out before they come in physical contact with the animal.
I know that's not how things work in the court system and the owner of the animal is responsible for the actions of the animals in their possession. But back to the actual story. She knew that the chimp was dangerous.... she knew it was out of control and could possibly harm her or someone else. Yet she chose to put herself in the position she was in. I feel back about the injuries she has and that her life will be drastically changed for the rest of her life but that's it. IMO it was her fault that what happened happened. If the chimp busted through her window and came into her home and did that I would feel differently.