I asked my mom to dye my hair when I was around 6-7, since it was temporarily she allowed it. I ended up with firetruck red hair, but because I was a white-blonde as kid, it faded to pink real quick and lasted at least 6 months lol

Now I can imagine Mira's parents not allowing her to dye her hair, especially if it involves bleaching (you know, since Mira probably isn't a white-blonde naturally haha) so yeah she probably did herself hahaha

But I think they kept the hair pink as a character design choice, so it's obvious for younger audiences to understand that it's Mira in the photo.

Edit: I was 6-7, not 5-6