Maybe I'm reading too much into her, but I think Andrea has more to her than outward mannerisms. In order to survive the Game of
Who Companions, you have to know who to cozy up to and seeing that MC is becoming a more prominent figure within the Club, she seems shrewd enough on how to play up her eagerness.
But who knows, maybe she is just an overzealous pupper.
I definitely agree with you, you might remember in some of my earlier posts I mentioned similar thoughts. Andrea might be uneducated (no wonder with such a family background we heard some tidbits of), but she has retained a sunny personality and a disarming charm.
She was seemingly savvy enough to look up Vincenzo´s singer career and what stuck with me, Andrea is the only house girl using August´s nickname openly. We should not forget that she does so with his consent, she never was punished for it and August knows about Andrea doing so.
Going by what we currently know from the game, Andrea also evaded the "difficult" clients so far.
And now she is trying to secure her position on the "other flank". Our hero is becoming more important in the club, so keeping a good wire with him is a good idea. Certainly useful if anything would happen that upsets the status quo.
While we cannot be sure at this point in the game, I theorise Andrea pretends to be more airheaded than she is. Her sunny and playful personality is clearly genuine, but I believe some of her "quirkiness" is an act.