We had a lhasa poo and she had panic attacks when she was locked in anywhere until one weekend a friend kept her while we were away. Friend's doggie would lay on her owner's bed (where she could see the driveway) and wait. Our dog did the same thing from that time on. Not sure if your other dog could help you train her. I would talk to your vet about it because maybe she's not being bad, maybe she is claustrophobic and panics because of it. She is a cutie. Hope it works out.