I'd put a solid strong well-latched top door on that stall NOW, before she gets any more firmly trained to believe she can escape anytime as long as she tries hard enough. They can hurt themselves with marginal horseproofing and/or a very strong belief in their ability to get out.
Might be worth cleaning your geldings' sheaths if they haven't been recently and if it's something you're comfortable with doing -- sometimes a mare can get a nasty infection from being bred by a grotty gelding (and yes, a considerable number of geldings *can* breed mares, not get them pregnant obviously but enough that it's best to have them clean as possible).
Most mares will have heat cycles for most of the year, from late winter to well into the fall. Enjoy
Have fun,
Pat
Might be worth cleaning your geldings' sheaths if they haven't been recently and if it's something you're comfortable with doing -- sometimes a mare can get a nasty infection from being bred by a grotty gelding (and yes, a considerable number of geldings *can* breed mares, not get them pregnant obviously but enough that it's best to have them clean as possible).
Most mares will have heat cycles for most of the year, from late winter to well into the fall. Enjoy
Have fun,
Pat