Ami doesn’t socialize much. In social situations, she’s mostly let the others take the lead. She went shopping with Usagi, went to the shrine and the amusement park at Luna’s suggestion, and went on the cruise with Rei.
Sailor Mercury, though? In battle? When there’s a clear goal in front of her? Sailor Mercury knows what’s important, and if you forget, she has no trouble reminding you.
I suspect if we ever saw what Ami was like when she’s working on her studies or her homework, it would be a lot like this.