I have a 4 year old pomchi. She is fine with me and insists on sleeping between me and my 8yo in bed. She is my baby and she knows it. But just in the last month shell be sound asleep in bed and if my 8 yo shifts, she turns around growl and nips, face, anything she can grab. Shes never . Done this before. My 8 yo will call her over, tail wagging shell come, shell hold her and make a split second to change her mind, growl and nip. The, when I scold her, a harsh verbal (she does understand no), she comes running to me turning toward them like shes the victim. Nothing has changed with us, whats up with her?