Please help me understand your theory.
GOING 
Going back to the 1st thread. This is going to be a longer post to help bump info obtained from the beginning of this case.
I tried to find the Airbnb reviews that mentioned
Dia, but they're missing like she is.

There were reviews from people who met Dia on the property. I saw those reviews, but they're gone now.
I did find reviews mentioning
the Host "Diana" taking care of the properties. There's a pic of her. I found this review from August 2020:
Vacation Rentals, Homes, Experiences & Places - Airbnb
snipped... "The cabin is great for cooking, entertaining and relaxing. There’s also workout equipment so you can keep up with your fitness. Harper and Diana are very accommodating, we got a complete tour of all the property..."
(Please note there may be two Diana's . I'm not sure Host Diana is the same person that was the one mentioned in the news article reporting Dia missing.)
Friends and family of missing woman remain hopeful | Valley News
“Although the sheriff’s search and investigation is still ongoing, Dia has been formally declared a missing person,”
Diana Souza said. “If you see her,... "
@SoHelpMeGod did a great job researching Dia's properties. Look at Post #203 and some other posts on the 1st thread to get an idea of the recent Airbnb business.
My point being Dia had staff and a life on that property and would be noticed if missing. It's true that the businesses meant more strangers were coming and going on the properties, as well as staff, farm hands, handymen, etc.,
First Thread, Post 203--
CA - CA - 4 (previously 6) individuals missing near Idyllwild, summer 2020
Dia's properties and to check out the current reviews:
Listings from Diana
The main house is available for weddings or special functions.
Please check out our site: ********. Rooms in the main house are also available to rent at air bnb *** bonitavista...***.
Please note this is MOO and some Bolded By Me.