Dear Roland
Don't worry about this behaviour lots of dogs pick up toys/slippers/socks etc and run about with them after an event that has excited them. We don't really know why they do this but it is more than likely something to do with having something that belongs to them or you which is familiar and fits nicely into the mouth.
However, an hour is quite a long time which possibly suggests that Zoe finds it hard to relax. Ignore her behaviour remain calm and stick the kettle on. Do not chase her about or show that you are worried about her behaviour. Perhaps give her something to do like a Kong with a small bit of marmite or meat spread smeared inside.
Many dogs will do this when their owners or visitors come into the home. Perhaps they are saying I live here and this is mine.
Hope this helps
Rosie Barclay