Ok so my horse Lilly has never really been around another horse for years and just yesterday I brought my horse, a mare btw, out to my friend's house for the summer maybe longer. Well the moment we got there my horse and her horse, a gelding but well trained, got along real well but it seems as the day went on my horse practical ignores me and puts all her focus on my friend's horse. When I would lead her she would like drag me around and when my friend would lead her horse away, mine would through a tantrum (neighs a lot and paws the ground;trys to follow but is tied up). She's not as bad when riding, though, but will still neigh and try to follow the other horse when the other horse gets too far away from her. She used to be a really lazy horse until I moved her to my friend's place. When I lounged her though she seemed to have behaved a little better.
Is this just from not being around other horses for so long? Will it start to get easier working with her ? What are some things I could do when trying to get her to focus on me? I can't really seperate them when I let her graze because theres not an extra pasture. I know horses are herd animals but is it just me or does it seem like my horse is already overly attached to my friend's ?