In my opinion she was heavier than 100lbs too, as well as older than the estimate.
What about Frances Allen?
https://www.findthemissing.org/en/cases/20744/0/
(Don't know how to link on Tapatalk, sorry[emoji53])
Red hair, 59" tall (4'11"), 135 lbs, age 46 when missing in March 1984 (which IMO is a realistic age), from Kentucky. No picture. The only thing is, her DNA is entered; I don't think that's a 100% guarantee these aren't the same person. It may be worth a shot to submit her.
I don't live in the U.S., would somebody please do it for me if you think it's worth a go?
Thanks[emoji4]