The start of her head looks way better IMO!
Before you continue, I forgot to state that it's a good idea to use SRB2's green color instead of the color
you want to be changeable
You also have to do the shading with strong color, it's a good idea to skip 1 color to avoid the game using multiple times the same color in the ones that seem different for the original sprite, because this is likely to happen in low-paletted colors, like the pink.
I guess the changeable color will be her blue fur here, so it's a good idea to try doing the same thing I'm doing to Fleshbows:
With those differences, the game rendering is not even comparable:
With pink:
With green + strong shading