kind of reminds me of Coffee Bean's current change in color. i think it might have to do with where Maze is at weight-wise, but that's a total guess.
tbh, there's a chance at next shed where she'll shed out and have that same brown/red coloration come back a bit. again, total guess (remember Ax01 and their Clown?).
have you noticed any darker coloration on her sheds? i've noticed this with Coffee Bean; wish i had a photo.
EDIT: i notice beeps start to really grow into their adult colors around 300-400g and continue from there.