i'm bad at explaining things, so i'm sorry if this doesn't make sense 
basically i've now got my mum's old game & switch because she doesn't play it anymore and i wanted to reset her island
however, her character has a LOT of diys and catalogged items
is there a way i can temporarily move her character onto my main island on my switch
reset her game
and then move the character back onto the new island on my mum's old switch
and if i can do that, will she still have all the diys, nook achievements and catalogged furniture etc?

basically i've now got my mum's old game & switch because she doesn't play it anymore and i wanted to reset her island
however, her character has a LOT of diys and catalogged items
is there a way i can temporarily move her character onto my main island on my switch
reset her game
and then move the character back onto the new island on my mum's old switch
and if i can do that, will she still have all the diys, nook achievements and catalogged furniture etc?