Isabella's Green Inkling Hairdye

Isabella experimenting with her usual hairstyle with a different method of colouring, using organic green ink to dye her highlights is a dangerous combination and a difficult thing to keep natural- Inkling ink in particular is prone to clump together and take on a distinctive sheen. You don't control it or wash it out when it starts to do that- it'll coat your hair entirely and begin to permeate the body.
The dragon would find out the happy way when she gets a shiny green coloured scalp, before her muzzle shrinks away, beak reforms, tentacles reshape to length, eyes grow to their normal size and green colour and that silly fur and those strange clothes all are replaced with the freshest of looks instead.