Thanks for the info, it makes sense. I have lots of toys for her and give her a special treat 9greenies0 just before i leave. When i came home today I found she hadn't even touched it...she usually loves them. I will try taking her for a long walk next time, but I think this behaviour is out of my hands.
Hopefully she grows out of this stage. I wish i could spend every minute with her, but someone has tp work for her kibble!