Time. And don't force the issue. Eventually she'll understand that she's isolating herself from everyone and everything.
Does she like to play fetch? Throw the ball. I have a special call for Puppy Treats!!!! - no one sulks when that happens. Even if they're outside, in they come.
It may help to put the pup in a pen for a while and pay special attention to Her Majesty, to show she hasn't been forgotten.
She'll come around ... |