Indeed.
OP, call your mare on her disrespectful* behavior. And then make yourself a credible, worthwhile boss.
I used to own and really like the usefulness of the kind, good ol’ boy gelding. Now I own a sensitive, self-possessed mare. Fortunately (and on purpose), I bought those minds for different disciplines. I don’t think my current mare, for example, could have done the hunter gelding’s job. Also, she could not have developed with me as her rider as the horseman I was when I owned the gelding. Rather, this mare has made me really up my horsemanship game and I adore her for that reason.
All that is to say that you have to like what a strong mare is: She is psychologically your equal and her own care-taker, so she’ll naturally pursue her own agenda. You will be either wall paper (or an annoyance), or someone who can intervene in her world and be worth her help and her obedience. But that depends on your ability to negotiate your place in the relationship with her.
Philosophically, I don’t think that’s unreasonable for a 1,000 pound grown-ass adult. But it does mean that I need to be prepared to participate in a partnership with her. I don’t get anything that I don’t ask for. But the more things I ask for, the less hard it is to have her comply. Several years into owning her, I really, really love the way she participates in her training. She tries hard and is an extremely good student. In comparison, my gelding was the kind guy who wanted to cruise through life getting the “gentleman’s C.” Yanno, I’m not sure I want that kind of ride anymore.
So what kind of relationship did you want in owning a horse? That’s worth figuring out. Because your mare is just “doing her” and isn’t going to change except as her riders and handlers require. That said, you won’t have much affect on this mare when she’s not “on the clock.” But you can get lots done by managing her living situation well so that she’s happy. A mare will try to solve any problem she has, her way. Either you solve it better or stand back and watch her to do it. But she won’t just roll over and accept a bad situation like a neighbor in a stall who messes with her peace of mind.
Also, I thought that ovarectomies in mares didn’t reduce the mare-ish behaviors because it is progesterone, made elsewhere, not estrogen that causes it. But it sounds like your mare is worse when she is in season so you guys just wanted to stop the cycling?
Mares who are intelligently managed and handled and ridden can be fine citizens, IMO.
*If you have read this far, I hope you can tell that I mean the word, “disrespectful” in a specific way, not the way all Natural Horsemanship gurus can tend to spread that term over all kinds of horses, even those who are inconsiderate of their handlers because they are uneducated. What I mean in calling a mare “disrespectful” is an animal who knows she probably ought to obey her handler (or at least not attempt to chase her off with pinned ears), but who chooses to “go there” and exert her power. I point this out because I think it’s important as well as safe and even fair or humane to let the 1,000-pounder know that I am in charge. We can have a a collaborative relationship where it’s kind of “from each according to abilities to each according to her needs” later. I’ll do things for a mare that keep her safe and her feeling successful in her work; she’ll keep me safe from things like cattle and other horses. But I must establish in her mind that she must consider me when the chips are down and she’d rather not do as I’m told. That’s just a matter of being safe. So I do need a strong mare’s respect. But I don’t need to pick on her daily to get that.