Another unidentified girl, aged 5-7, was found near Ft. Stockton in 1984. PMI was three years, so she would've died the same year this girl was discovered. Their cases are also right next to each other in NamUs (14970 and 14971).
The National Missing and Unidentified Persons System (NamUs)
I wonder if they're connected? I can't help but wonder if these girls were sisters.
ETA- Both sets of remains are partial skeletal, and only one skull was found (for the girl in 1984). I wonder if these are two sets of remains belonging to the same person, instead of being 2 different girls. PMIs can be wildly inaccurate for skeletal remains, so it wouldn't surprise me.