>>22258I only have experience with first-aid from the army, so feel free to correct me if I fuck up, but I would first of all shout for help, since she appears to be stabbed on her diaphragm, meaning that I probably can't do much but wait for the ambulance.
I would probably try to apply bandage without moving the knife if she's losing blood, and I'd be on the lookout if the assailant should return.