You’re not necessarily imagining a problem, but the signs that you describe are also not a giveaway for any particular problem. One thing that I’d think about in a 19 year old mare with signs that you describe is Equine Cushing’s Syndrome – you can read about it by CLICKING HERE. Older mares can exhibit some weird behaviors due to Cushing’s. An ovarian problem is a less likely possibility, as are other problems of the reproductive tract. Either way, it’s certainly worth having your veterinarian take a look.