Well we should start with what aspects of her personality could be attributed to it.
1: Shyness, especially around strangers. She's also bad at eye contact, evidenced by that giant mask she wore.
2: Meltdowns. The ones we see during her palace are due to hallucinations, but when we find her at the electronics store, the crowd and noise overwhelmed Futaba.
3: Tact, or rather a lack of. She answers her own adoptive father with one-word sentences. While not rude, Futaba is impersonal and lacks courtesy.
4: Hyperfocus. When something captures Futaba's attention, it holds her hostage. She spent a whole day hacking, oblivious to the actions of Akira, who was in the same room.
tl;dr it's entirely possible Futaba is somewhere on the autism spectrum.
