Once in a while I get questions and I don't always have the answers. What that happens, I do research. When I do research, I bring you what I found.
In this case, I was asked about autism and puberty, specifically for girls. While I have three daughters, none of them live with me and I wasn't with them for this part of their lives. Hey, I live 14 hours away from the closest of them, okay? And I'm a DAD, not a Mom, so that really sets me aside on the matter. But I take it seriously when someone is looking for information, so this is what I found. From just these three links, I think you'll have the basics well in hand, plus some good tips.
How to help girls with autism through puberty is a blog post at Fourplusanangel.com by Jessica (last name unknown). Yes, that's a link up there^. It's a great starting point for no nonsense advice. It doesn't hit on the attitude dangers, but it's a pretty important starting point all the same READ IT.
THIS POST from musingsofanaspie.com is "What else autistic girls need to know about puberty". I found the section on hormones very informative. Heck, it's all informative. So read it next.
Finally, I bring you to Abilitypath.org with THIS. It's not as personable as the blog writers above but it's clinical advice seems applicable.
Still looking for info? If you are on Facebook and have lots of friends, there are several popular ladies with autism online and I'm sure any of them would be glad to lend advice on what they did or do to deal with puberty and it's pitfalls.
Hey, puberty at its base scale is enough to make you want a six month vacation on the moon. Just remember that this is no picnic for your kid either. I can only imagine what a nightmare it must be for girls. Cramps, bleeding, using pads; all lead to so much more than what boys have to handle. Just hope that your child has the easy going kind (if there is such a thing) and go from there.
What I get from all that I saw is this: EDUCATE, EDUCATE, EDUCATE. Teach your child early and often. Remind and reapply over and over again. Do your best to be patient and non-accusatory.
Finally, remember love and caring. Let them know that it will get better and they will eventually get used to dealing with this annoying aspect of life.
Good luck, parents!