In normal interaction, she hovers above 'barely functional'.
I don't see that. She seems quite happy and quite functional. Just not normal. Like many occupants of the QCniverse.
That's not how I read her. Yes, she's capable of quite complex communication but she just doesn't seem to have any
instinct for social interaction. I mean, read her apology in panel 2. Doesn't that read like something she's rehearsed or even been told by her parents or maybe her therapist? She may agree with the general spirit of the words but, from the way she's expressing herself, she doesn't come across as fully understanding it.
What does she do then? Like a six-year-old child presenting a flower to seal the apology, she gives Bubbles a idiosyncratic gift!
I'm not talking Emily down. She's a perfectly nice, sweet and good-hearted young woman. All I'm saying is that, on a certain level, she'll always have this childlike aspect in which she fails to consider or even fully understand the social consequences of her whims.