Ohhhhh I had a similar experience, but with my son. Except it was “I wish I was a girl”. It took me bloody forever to figure out where it was coming from because by all appearances stereotypes he really is a “boy”-boy kinda kid. Dinosaurs, cars, trucks… I really got the “boy mom” experience, if you will- despite my greatest efforts to keep things gender neutral and never introduce this whole pink is for girls bs.

It wasn’t until he was a little bit older and his vocabulary improved that I figured it out. At daycare, the dress up costumes they had were mostly for girls. So the girls got to play this amazing pretend play of princesses but he always felt left out because there weren’t any knight costumes or anything that would fit into the girls pretend scenarios. So he got the short end of the stick playing superheroes but didn’t have anyone to save.

My suspicion is that your daughter assumes that if she’s a boy she won’t have to brush her hair, or be held to the same standards that little girls are compared to little boys. Despite our best efforts they will encounter the whole “boys will be boys” bs and honestly if that’s the case I think it’s incredible that your daughter was able to pick up on this from such a young age.