Another term for "female friend"?

Is there a term in English that describes a woman who is just a friend that isn't ambiguous with a lover? I often use "female friend" because "girlfriend" could be mistaken for a lover. Yet I've heard that some minority of women find the term, "female", offensive. I was thinking of writing "girl friend" with a space in between like "guy friend", but someone might still think I just put the space in between by accident as a typo and mistake her for a lover.
Another term for "female friend"?
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