@moomoogalicious I don't think she started exhibiting any traits until around high school. When she was little, she was pretty normal, but she did have very particular interests. For a few years when she was younger, she was obsessed with dolphins, and then, when she was 9, she became obsessed with the show Friends (and constantly beats me at Friends Trivial Pursuit aha). She's also always had a good memory, and she's always been really reserved around family members aside from me, her dad, her older brother and her grandma. Even now, she struggles interacting with her aunties and cousins, even the ones she's seen almost every weekend since she was little.
In year 7, she struggled to adjust to the change, but now she's doing well. But, by year 8, she was having frequent panic attacks and got overwhelmed by practical lessons (PE, DT and in practicals during science). She also started to get new friends, but it was thanks to her life-long best friend who often helps her with those sorts of things. Day to day, her traits can affect her, such as when she gets annoyed when the TV schedule's changed, or when she's reluctant to do the washing up because she has an issue with dishwater, crumbs and food-related filth.
This might make me seem ignorant, but she also demonstrates a little lack of empathy at times. She's, generally, pretty empathetic, but, for example, we were watching the Voice Kids, and then a mother started crying because her daughter got through, and then DD asked "Why's she crying?". I told her "She's happy her daughter's gotten through.". She responded with (paraphrased) "So? Why do people cry when they're overjoyed? It's ridiculous.". I'd like to say that she's actually very clever and perceptive, even if she doesn't always understand other people all that well.
Also, she'll often ramble to me or, before the pandemic, her best friend I previously mentioned about the show she's watched (and neither of us have) or a crime vaguely related to something we've said (she's fascinated by true crime), and she won't notice if either of us are uninterested.
She also has issues communicating at times. A lot of the time, she stutters (though she doesn't have a proper speech impediment) and, a lot worse than most people, struggles to speak. By that, I mean she'll ask me to get her a drink, and then, when she can't finish the sentence, she'll do a drinking gesture or just point to her cup.