A through-line with Sandra especially is that, early on, she genuinely did not, and to some extent still doesn't get Nina's attraction to her wolf form. In fairness, Nina's not especially equipped to explain it, either, but, to her mind, she's wasted enough time being closeted that she's earned the right to just-- not interrogate any of it.
So, she won't. And Sandra, I suppose, will just have to live with that.
***
I'll get back to this one eventually. You can tell it's getting to be about a year old now, though: I very specifically avoided showing Nina's face, and was still feeling skittish about being too adventurous w/ the pose.