Out of those mentioned, I like the Angel Montre the most.

If she has a planned personality, then I'd go with a color/species that mirrors the personality, but I think that's standard advice.

when I saw Nous, I immediately thought:

if you want to change Volkriye, I'd say the Montre, but the nightmare looks good already ;)

Oh god. I love both of those ideas. You could always use one idea for Nous, and the other for Volkriye? lol