She is cute as can be! The first name that came to my mind was peanut! Of your list, I like Acorn. In my house she would be sure to end up being called Corny though!!!
Isn’t she some kinda chihuahua though? If so, shouldn’t her heritage be referenced? Like, she could be called Conchita, or, you know, Chiquitita. Or oh dunno, how about Bellota? That’s Spanish for “acorn”. Plus it sounds feisty.