I think a lot of the differences have to with how were raised. I know I was a lot more pressured to be "normal", to be quiet about my feelings, to not argue, etc...people don't recognize intellect in girls as often as they do boys, either. They interpret it as obstinate or stubborn behavior.
I had one therapist just flat out call me "oppositional defiant" because I had trouble with my school work and understanding the benefit of certain types of work. Then again, she also helped guide me towards my HFA diagnosis, as well.
I've been given medication for both anxiety and ADHD, but the latter wasn't much help. I was more pressured into taking this med called "strattera", and I had to repeatedly ask, over the course of a year, to get my parents to let me stop taking it. Every time I complained of a side effect, they would just tell me I was exaggerating or was just being "obstinate".
With other mental health issues, and when talking about autism issues that may be affecting me, people will frequently imply that I'm just a drama queen or I'm outright lying for sympathy/attention. I'll never fully let my parents know the extent of my "issues" because of this. It even makes me sometimes unable to trust my own feelings.
I think doubting the authenticity of women and girls experience adds to the sparse understanding of autistic girls. But that's what from my limited perspective and experience (I'm only 17, after all).