My dog is acting weird?

I have a two year old mixed breed dog (husky, lab, spaniel and golden retriever mix.) she's extremely hyper and high strung and therefore prone to anxiety. I think she has a psychological problem because she compulsively licks, not herself but people and the air if you're associating with her. We have 3 other dogs and they all get along great, are exercised daily, healthy etc.

I've noticed some personality changes in her though. On June 1st I opened up a dog grooming business out of my home. My dogs don't come in contact with the other dogs but obviously hear and smell them (in a completely separate part of the house.) and I have always worked with dogs just not in my home. for the last week-two weeks, she's been quite posessive of toys and bones. Not snappy or anything but when she has a bone or toy she hides for hours on end with it. She also has taken to carrying around a stuffed teddy. She doesn't play with it just keeps it with her which usually it would have been ripped to shreds. She also now hides under our bed, and stays there for hours, and won't come out if we call or coax...but when she is out she's still happy wagging her tail and everything. She's eating, drinking, going to the bathroom, not acting like she's in pain...

Is it because of the other dogs in the house? She's feeling threatened and is coping with her possessiveness?