Whatever it was, it went away with her next shed. I couldn't find anything wrong with her belly scales, and her enclosure was growing back together nicely, so I reintroduced her last month.
Thus far there has been no signs of another flare-up, so I'm hopeful that her infection is now behind us. I still feel I'm going to be on guard and watchful about it for some time, but optimistically, if it hasn't returned after a month of sitting on the dirt of her enclosure, I don't see a reason why it would. Last time I put her back before she was ready, the flare-up was immediate.
Here she is from the past few months:
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