Also, ais's emotional development is a bit weird. She is not a child. And she is by no means dumb. Even during that very first battle against that first demi spirit in SO 1 on floor 50, she shows decent levels of intelligence. Its more so that ...well, yeah, ais doesn't open up enough. plus
Ais lacks a lot of interactions that everyone else takes for granted so her societal development is far lacking (hence the air headed stuff). As a result, even she does not understand her own emotions in my opinion. Well, her treating bell as a rabbit is a bit.....childish ig.