My guess is that her hair is a lot curlier than anyone realized, and getting that moisture infusion really boosted the curl, which created the "new" volume.
We see it a lot in the Wavy/Wurly and Wurly/Curly threads... people start taking steps to start moisturizing their hair and stop abusing it with harsh products and heat styling, and "all of a sudden" they have curly hair.
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