i think it's a good call to include that note at the end of the chapter because nuances like that are needed with series like these, especially considering Makina said she developed a "heart" literally in ch.1 which also means she might think that the error she have in this chapter is because of it (since you know, actual robot might not even mistake an adult for a kid lol)
"What'd you do this weekend?"
"Not much. I've been trying to make sure my babysitting android doesn't suspect that I'm not a baby, so I've been Googling different kinds of behaviors I can mimic to keep the charade going."
"What?"
"Goo goo"
"Aw, what a cute baby!"
I was wondering how much longer they'd keep this bit going, but could it be so soon? I doubt it... something tells me she'll conveniently backpedal on her logic or forget the moment she finishes charging...