Even though he doesn't have much contact, she will view him as part of the 'colony'. Yes, Sugar Gliders do relate and accept us as their own, once they have developed a trust/bond with us. However, they will bond closer to the one who is their primary care giver. If they see you two together all the time, they will trust in you to know that you will not let him hurt them.
I've had my two babies for almost 7 years. My husband barely interacts with them, they tolerate his presence, but are not comfortable with him for more than a few minutes.