I think i know how you feel- this year in my gym class, i had a teacher who did not understand AS at all. She is a very rough person verbally, and on our first day of class, she was impatient with me and i cried (i do this much less now than i used to, but still a little too often). She also told me to look her in the eye, and i corrected her and told her about my AS. She was okay then, until we did this unit called project adventure. It seemed that when i did something right, she would never notice, but if i made a mistake, she announced it very loudly. I am uncoordinated and not an athlete, but i was actually mediocre or slightly better at that unit. But it became so that whenever any activity went wrong, even if it wasn't my fault, people blamed me. And one of the other students began harrassing me about how bad i was at the activities. I cried for the second time during that unit, and she told me to sit out of the class and made me sit in a spot where everyone could see me with tears running down my face. After i was able to transfer out of her class, she wrote me up multiple times for not coming to class (i wasn't in her class anymore, and hadn't been for almost a month at that time- she was contacted, but never read her emails for some reason, because she never knew what was going on where i was concerned) and i got called into the Dean's office (thank god she understood). She also proctored one of my exams, and was the only such proctor to question me about bringing my diabetic supplies into the test area with me (i have type 1 diabetes). All my friends hate her too, and they are NT's, so it's definitely her.
My (unsolicited) advice is to find for this farm lady some sources on the effects of autism or AS, but if she still won't believe you, you need to extricate yourself from the situation as soon as you can. These things wear on you daily, as i'm sure you know. You don't need this stress, and she really doesn't matter. Try to remind yourself that although the majority of the world is small-minded and brutish, there are some very kind, accepting, intelligent people out there. Best wishes, ElliottJumpshoe.
PS. Can you use this woman as a character in your writing?