I emailed the editor of the Santa Rosa News regarding this case, providing a link to this thread and also the Facebook page. It is a small weekly paper now but appears to be the largest in that specific area. I have no idea if they will respond to me, or contact AddysMom or others who are doing direct research.
Hit or miss with small town media like that. Some won't mind briefly deviating from their typical approach with an article or two, while others will stick with plug and play local developments.
When I sample Websleuths in general my overriding belief is that media is underutilized, particularly in comparison to searching for one potential match after another using facial features, etc. I applaud that effort but logical weighting needs to be applied. Local media emphasis can spark a potentially significant memory or detail from someone who was involved at the time. But if they don't know anyone cares and is searching 40 years later, that memory is wasted and eventually gone.
Another option is contacting television stations, or larger media in Albuquerque which is due west on I-40, maybe 100 miles or so. You never know when some aggressive reporter is interested in the DNA genealogy angle but hasn't has cause to apply it to a local case.
I have driven that route between Las Vegas and Miami so many times. I normally stay for the night in Tucamcari, which is a small town east of Santa Rosa.
It looks like this case generated plenty of local news in the early stages. That's why I think there might be potential for revived interest and potential memory. I noted on the Facebook page that several local articles were linked from the first few weeks, with law enforcement sending specifics across the country in hopes of identifying the victim. Then apparently it all but stopped other than mentions of her during the trial.
I would try Diana again. It had to be shocking to her to be located and contacted out of the blue, on such an old traumatic topic. Later she might calm and reconsider. Maybe call and ask if it is okay to send her a letter. Sometimes an old fashioned hand written letter like that has amazing impact, and the reader returns to it again and again. Bottom line, Diana has so much more potential than anything else, toward identification. Nine failures and one tidbit from her is more valuable than 9 out of 10 successes with another source.
Otherwise, I might contact Las Vegas authorities. Since Lanphear was arrested there, and also the Jane Doe's guitar was pawned there and possibly recovered by law enforcement there, that would be Nevada police doing it, not New Mexico authorities. If Nevada was involved on multiple levels they could retain information in their records. It is likely that Nevada law enforcement was involved in the trial, toward testimony, etc. That is standard when crime sprees of this significance cross state lines.
Worth a try, anyway. I'm not sure if the proper contact point would be Las Vegas Metropolitan Police Department, or Nevada Highway Patrol, or Clark County Sheriff's Office, or City of Henderson Police, etc.
I lived in Las Vegas and Henderson for 24 years between 1984 and 2008. If I had to try one, it would be LVMPD first. They are also most likely to have someone who would care, and direct to a source who might have older records.
I am always amazed how many cases have some connection to Las Vegas. This case jumped out at me because after the prison escape the couple stayed at El Sombrero Motel on the Strip. That building was called Pollyanna, or something like that, when I was in town. I had a friend who stayed there so I had to drop him off there all the time. Let's just say it was the definition of cheap. It is far south on the Strip. The motel was torn down years ago but the city is expanding in all directions and recently I was told there are plans for some huge Pinball arcade on that property.
Best of luck on this case