Accepting a customer from another barn in the same area is not generally considered “getting involved.” I don’t know any BO that would turn down a perfectly good customer from another barn in the area because of not wanting to “get involved” unless there were other concerns.
I don’t know you, nor do I know your BO. But my advice to you is to
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Get out of there before three months. If you are indeed a great customer but people in the area don’t want to take you on because they don’t want to “get involved” then I think that your association with this person could be damaging your reputation.
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Don’t take this personally, because I tell everyone this, but check your own behavior. I understand you are frustrated, but do your best not to let this person get under your skin, and do your best to exit this situation without getting sucked into the drama. No, it is neither fair nor good business that your BO keeps changing the rules/expectations, but there is nothing to be gained by engaging with her over it. The horse world is by nature a small world and your reputation is more important than being right. It’s none of your business how she feeds or manages her own horses. If you dislike the way someone manages a barn or you find the rules ridiculous, the appropriate response is to swiftly and pleasantly move on.