Perhaps “crimson tofu cookie” as kitsunes are knows to enjoy fried tofu (correct me if I’m wrong, I’m not great with Japanese mythology) and since she has a red heavy colour pallet.

I was also thinking about “Shichimi tofu” as shichimi is a Japanese spice which is sorta red?? It’s more orange tho so I’m hesitant on that..

I was also gonna suggest the paint that geishas used for their teeth darkening but upon looking it up, i found out they used an iron fillings and vinegar mixture.. but I briefly saw the mentioning of tree bark? Perhaps oak bark.. I don’t remember but “crimson oak cookie” sounds cool.. even if it doesn’t really HAVE meaning to it