What are your advices to bond with a horse who is really attached to another horse?

Groundwork, grooming, and liberty are good, but just spend time with her! Handgraze her, sit with her, or just sit in or near her pasture. She’ll start looking to you as a herd member
I would spend more one on one time with the horse, doing ground work and or grooming. Try to establish that you are the boss on the ground so she will trust you more. Hope it helps!
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