Interestingly, Jenny, inspired by the messages here, suddenly realised the problem with Rosie. She was angry, yes angry, with Jenny about the fact that Bing wasn't here because she had seen her take him away.
It might seem a little far-fetched but Jenny recalled that some years ago when our young Morgan mare was sent away for training for a few weeks, my Westfalian gelding, some years older than her and who had 'raised' her from a foal was behaving very oddly towards me. He would uncharacteristically glare at me with bloodshot eyes when I went up to him in the field and would then paw the ground (or should that be hoof the ground?). Suddenly I recognised that he was angry with me as he had watched me lead her to the horse box.
Then, as with Rosie now, the answer was to show a little understanding and compensate with extra attention and love. It worked brilliantly tonight and Jenny is delighted to have her little girl back againā¦