As far as being a bitch goes, I think all women have the capacity to be a bitch. Just as all men have the capacity to be an ass.
And Pop Tart Fairy isn't actually a diminutive. It's simply a nickname. I don't think you can actually have a diminutive for A. What's shorter than one character? Although I must thank you for teaching me a new use of that word:
extremely or unusually small : a diminutive figure dressed in black.
• (of a word, name, or suffix) implying smallness, either actual or imputed in token of affection, scorn, etc., (e.g., teeny, -let, -kins).
a smaller or shorter thing, in particular
• a diminutive word or suffix.
• a shortened form of a name, typically used informally : “Nick” is a diminutive of “Nicholas.”
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