I have a 16 week old female. She is a great dog for me, however, for my wife she is a nightmare. I will give you a little background. I am very firm with my pup and she was complete opposite for the first several weeks. Well things have gotten to a point where my pup will bite her constantly and will not relax when she is only with her. For example, the other day I spent several hours with my pup roaming the house and playing while I was doing house work and she was behaving perfectly. I had to run out for a while so I left my wife alone with her, as soon as I left she started jumping on chairs, biting her leg multiple times and just being overly rambunctious. All things she never does when I am around. As soon as I came home she was completely fine again.
What can we do to fix this now, while we can still control her? What are simple things that will help my wife establish her self as the alpha?