Ah good that you asked i actually prefer to go by god usopp.
I mean hes trying but not really taking it seriously anyone that paid some attention would figure it out.
Still since this is a comedy style manga i guess she'll A)stay clueless or B)figure it out and pretend shes still a girl anyways.
Authors gotta milk the crossdressing and the will they wont they as much as possible right? I'll respect the author if theres some actual progress and mom straight up says it but cmon bro we all know that aint happening.