Hi there
My daughter (SWCAH) is 11 (12 in April next year) and she also is a tom boy. Her chosen sport is motocross and she does really well at it. She came second this year in her class and even beat some of the boys. She is also very slender and small for her age. She doesn't have a huge appetite either.
I think 12 is considered fairly normal to start your period these days. Any earlier and I would be worried but I think 12 is just normal. I am wondering when my daughter will start showing signs of puberty, none so far.
We also give the solu cortef injection when the kids are sick. It sure beats going to the hospital every time
Anyway good luck with your girls.
JANE