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This may be a little bit of a stretch but Yvonne Elizabeth Ramirez?
She’s a runaway with no photo. She ran away in February 1999 at 15, meaning she’d be 18 at the time of Tempe Girl’s discovery.
She was a habitual runaway and told nobody that she was leaving. She is missing from San Leandro, California. A bit of a stretch, yes, but it sounds plausible to me.
She’s described as Hispanic with brown hair and eyes, 5’4” and 120 pounds. She is 3 inches taller than our girl but not too far off where it’s an automatic rule out.