No one would doubt you love your horse. I think you are crazy in love with her, and she strikes me as a real character and intrigueing, challenging and frustrating. Just for a bit, though, don't think of her as "your" horse. That gets in the way. Try to imagine that you are the paid trainer of this horse. You are being paid to get the most out of her, so you cannot be swayed by any emotional fears, such as her "not liking you". YOu need to be as tough as required, firm, clear , in and do the business, then leave the horse along and on to your next client. Think, "if I was a trainer, would I want my client to have this kind of behaviour in her horse?? No, I need to work on this and clear it up, whatever it takes. "
Perhaps this way of thinking will divorce you from concern that G continute to LIKE you, which keeps you from coming up to the level of authority that G requires.