I saw your post and wanted to say Hello!
I am a mom of girls, though they are older than yours...Mine are 16 and 18. Very long story short, my 18 year old was diagnosed with ASD this summer. She is a very "verbal thinker". Also has NVLD type of diagnosis from when she was very young. My 16 yr. old is said to be "gifted" by the school. My girls are similar in some ways, but very different in others.
I guess it was lucky that yours were identified early on. Mine really had all the signs, but even just as long ago when she was a small child I don't think Dr.'s or teachers (or parents) were as good at picking up the signs in girls.
So I don't have a lot of information about formal therapies, etc. But we pretty much took things as they came ...and tried to encourage her outside her comfort zone, but then learned to recognize when to let her be. She has grown up to be a beautiful, kind girl. She does seem younger than most 18 yr olds and she does struggle socially with her peers and with some anxiety....that is the hardest part for her and us too to see her go through the social struggles and anxiety about them. At home she is mostly talkative (especially about her favorite subjects!) and relaxed most of the time. She is attending community college and we are hopeful about the future for her. We are learning to take things one step at a time and follow her "timetable", not what society says it should be.
I would say try to enjoy your girls for who they are and keep encouraging them. It does take a lot of time and effort with them, I think more than an average kid, but well worth it!