I doubt I'm going with Briggs, but I'm glad you did the pairings nonetheless (I'm determined to have it be a one-syllable English name). For her real name, I like Frances, Lucy, and Ruth (another commenter mentioned this) the most.
For the pseudonyms, I think Carmilla might be a little too obvious, but it (like Camille in another comment) has me thinking Camilla could actually be a good choice. I also like Isidora/Isadora, Ophelia, and Genevieve. And maybe Selene/Selena.
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