Susan's gonna wind up with a full set, isn't she?
As stated earlier in the storyline, Grace doesn't care how her form is used so long as it's not used in public, so there's no need for people to cry out "not cool, Nanase, you should ask Grace before you make a fairy doll of her."
I mean, yes, I agree it would actually be polite, but Grace really would be cool with it (if not thrilled) and they know it, so yeah, not devoting any panel time to that debate.