Are you possibly pregnant or ill in some way that would release a change in hormones/pheromones that she can pick up on? Dogs' behavioral changes sometimes indicate something awry with their owner/handler that the person may not be aware of. I'm pregnant, and my dogs have both become very protective over me around other people outside the family, and want to lay on my stomach when they're on rotation. If there's nothing different with you, then you may just need to do some reinforcement training, working on separating her from you, rotating her out with the other dogs and giving each one individual attention.
You didn't lose your girl, you just lost your turn!
"In this breed, there's no such thing as an expert! The day someone says they're an expert, they need to walk away from the dogs, because someone's going to get hurt. You should be learning something new every day." John Maynard-Circle M Kennels