Help! Moms of adolescent daughters...
I dreaded this and for good reason initially. My 12year old aspie has finally managed to bath, shower and do her hair but periods were beyond her initially. Same as yours but just never bothered to change pad. I certainly did not chuck her ghastly undies. Normal wash after napisan soak and never mind if they look old and odd. I finally embarrassed her by insisting school nurse usher her to wc at break and lunch times and hand her pads. I also insisted she show her exactly what to do at school re bags and bins etc as they are not like home. I put new pads on her knickers after bath at night. And new one on am undies. I made her change her bedclothes each time they were a mess and made sure decent waterproof undermatress cover on. And put spare pads in her pocket and checked how many used. Initially none. Dark clothes not an option with school uniform luckily so she had a few accidents which did motivate her a bit.
And I had to crack and demonstrate tampons. So glad i did cos they suit her far better. And they fit in your pocket. I would have asked obgyn about lightening period too if necessary although 12is v young for the pill. And set an alarm at home when tampon time up or mobile phone alarm if she has one. Mine doesnt. I keep a close eye on how many she uses ina day and stress toxic shock is not something to mess with. After 6 months things have improved. Hang in there.
As for forgetting stuff i would suggest more visual aids, reminders, alarms, etc. one thing at a time so first make sure teeth being done twice a day unprompted, then bath, then periods etc.
If she doesn't have a sensory issue with pads, can you put pads in all of her underwear when you do laundry so that she is wearing them all the time? I'd rather go with the all the time way and spending extra money than have her continually soiling things.
Also, I agree that the pill may be a potential good idea. She will need to be seen by a gynecololgist though as most peds don't prescribe it. There are pills that will completely eliminate periods as long as they are taken regularly. A missed day will result in a period though and you will be back to square one with this issue, at least temporarily.