Sheryl Sheppard might be a match to this UID. Imo, she bears a strong resemblance to this UID's composites and description. I found a fairly clear picture of her that shows pretty good detail. It's a full shot of a cropped pic on Doe. I've linked it below. I am especially drawn in to her lips, front teeth, eye brows, and that ring.
I'll admit I did not read through all of the previous posts so if she's been mentioned and/or eliminated as a possibility already please disregard.
2337DFON - Sheryl Marie Sheppard
Opinion | A mother’s lingering grief: ‘I’m sure someone knows something’
Sheryl Sheppard — The Missed Lives Project
I called Sheryl a couple of years ago and she wasn't a match, but I agree she looks very similar.