We keep Trixie in a gated in area when we can't watch her as well. When you have a dog, I guess you can expect some things to get chewed on. Trixie has chewed through some cords as well and my husband got upset about it. Now, the computer room is off limits to her. So my advice would be to keep her in an area where she can't chew on anything when you or your fiancee can't watch her closely.
Pixie shouldn't be barking though when your fiancee kisses you. If you know the Dog Whisperer, he'd probably tell you that the dog is your leader and you should be your dog's leader.
__________________  Trixie |