My girlfriend, Jen adopted a female Peek-A-Chon puppy, Arielle, several months ago. I bonded with Arielle right away. Whenever Jen sits next to me on the couch, Arielle jumps up on my lap, growls, and bites Jen. Another thing Arielle does is; when I pay "too much" attention to Jen, she jumps up on me and starts licking my face like crazy. Why is she so jealous of Jen? What can I do about it?