I do not think she was a copy of Willow as she has many different traits but i also think that because Willow is such a well loved character and there was no character like her in ángel they took elements of her character (like being shy and awkward) and have them to Fred
i dont think fred was a copy of willow, but i also do think fred is a copy of willow, but i like fred shes sweet and shy, i guess she is in some way a copy of willow, but i dont care because fred is my first fav charector in angel
They have a lot of traits in common but there are differences too. So I don't think she's a copy, exactly. She might have been intended as ATS' version of Willow in some ways, though.