^^ unless of course people lease their horse out for the horse's benefit and not to make money
Dizzy, you're thinking all wrong here. Regardless of what the other stables in your area do, the 3-month lease is what this woman requires.
Sucking up to her and trying to befriend her just to get her to agree to let you lease on a monthly basis makes you no better than her, since you won't really be in it for the friendship, but to get something you want. That attitude really doesn't make me sympathetic to your plight. In fact, it makes me wonder about your ethics and morals.
Why is it not right for her to act as she pleases on her own property, but it's okay for you to be a con artist and try to get what you want out of her by pretending to be her friend?
You don't want suggestions on how to get back into riding and taking enjoyment from it, you want us to tell you how to scam this woman into giving you what you want. That's messed up.