I have had the same issue with my horses!
I had my mare and pony in a paddock and everytime i took one away the other would freak! I ended up not being able to do anything with my pony because it would leave me mare and she would either go through the fences or jump over them!! I am sorry you have had to go through this!
As for suggestions im not much help, I would say your best bet would be to speak to the owner.... Are there other horses other than your horse there for her?
Good luck with it
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~~~ Ebony--&--Abby ~~~
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