You have to watch her body language extremly close while your around ppl and stop it when you see her body starting to react aggressively. Ex. Ears back eyes low hair up walking slow tail down anything that looks like shes mad or unsure, and stop it. Snap at her or give her a little tap on the butt. Not a hit, just a assertive touch. And tell her u trust that person. If it is someone you dont trust then let her be protective. She will learn in time for baby.