For your information: I came across a newspaper article from 1984 about Broward County investigators who believed that Michelle was a victim of Christopher Wilder and tossed around the idea that she may be
UP1276, found in Broward County in 1982.
Their theory could not be proven back then as her dental records were destroyed when her dentist closed his practise. One specific matching detail between Michelle and the UP was a scar under the right breast.
I just wrote an email to the Broward County Sheriff, asking if they were ever checked against each other now that DNA is available. I'll keep you updated.