Ever so I connect the two in my head. I think it'd be a usable nickname, although she didn't go by one.
And I agree about the same-sex twins with a unisex/boyish name on one and a girlier name on the other. It doesn't seem that fair, but you never know. They both might love their names and grow up thinking "I'm glad I didn't get a name like Anabel" or vice versa.
I think Everett is hideous for a girl, no matter the spelling and I feel bad that her sister got such a great name.
Not a fan, but it's cute.