Just adding a bit of info that I learned today.
Tammy is being looked at by the Hernando County Sheriff's as a possible match to the two skeletal Jane Does found in serial murderer Billy Mansfield's property in Weeki Wachee Florida.
One of the two is discussed on this thread:
FL - Weeki Wachee, WhtFem UP12589, 20-30, 1 of 2 Buried w/2 ID'd Victims, Mar'81
Their interest in her case was in the context of that case. Apparently, there is some indication that Tammy knew the Mansfield brothers because they were frequent visitors to her parents' truckstop.
The problem with that theory is that both Jane Does are estimated to be between 20 and 30, and one of them had spina bifida.