I have an 8 yr old mare who once shared a paddock with 2 other horses who were introduced to her at a young age, she was always alpha horse. We sold the other 2 horses and she has been alone in the pasture for 6 years, not ridden much either. I have regained interest, and also the time, and want to start riding her again. For a horse that has not been ridden for 6 yrs she does awesome as long as she is by herself….get her by another horse, doesn’t matter the sex, and she turns into some sort of deranged horse, acts like she is in season, lift her tails, sprays "white stuff" , screams, kicks and paws, acts VERY MEAN..and does this all the time. She is not in heat that much. I just purchased a 7 yr old gelding to ride and keep her company, and upon introducing them, she ran him down, and kicked him horribly, she lowers her head and pins her ears back, SHE IS MEAN….What can I do ? Will she ever overcome this ???