Rebecca was a thought I had, with the nickname Becky. Hannah is also a good name for her. And I might like Bethany better than Elizabeth (though it might imply that her birth family was Catholic, and I'm unsure if that's a background I want to choose for her).
Magdalena is an interesting choice for the pseudonym! It's a different genre (Biblical) than most other suggestions, which I think would imply a more honest nature. Hmmm...
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