[JoeyP]

There's been a change in the pack ....
your little girl senses it and is somehow getting mixed signals
She doesn't know if she's top banana or not

when you get sudden aggression or changes in behavior like this it's because there is some power shift
You need to step up and show that you are the backbone of this group
Dogs sense sadness
But they don't react to it in the same way we do
They see it as a sign of weakness or an inability to lead

Have you been depressed enough not to play with the dogs?
cause THAT a Yorkie will notice RIGHT away

Try to get things back to normal and be fair and stern