@ShiShiShi I think they meant Bonney turns into her child form again. I saw spoilers mentioning before that implied her powers were triggered by emotions, by her being distraught which makes sense given how Oda writes too, lets be honest lol.
She's probably turned into a child as a desperate attempt to remember her innocence, her inner child and halcyon days before everything went wrong for her and she lost her father for good.
Not sure why the others would get turned old but maybe a subtle hint at how old Kuma really is? My friend said Kuma could be much older than we think due to being a Pacifista this whole time? Bonneys DF too maybe? Or even his "mysterious new race reveal"?
Bonney turned into an old queen before called Conney, which makes me wonder if that's her grandmother or something? Her mother's mother maybe?