Since I think public media regarding the missing are allowed on WS, I can say with some confidence that John Root Fitzpatrick had only one address in Morongo Valley, a mobile home park called the Roadrunner. I used publicly available records from an online service to get that information.
I believe Jin Fang traveled with cash, but it would be very helpful to know if she also had an ATM card. Since she was also spending time in Europe, she could have had a credit card. The bills and records for those cards have to be available somewhere (most people manage these things online - mine are all managed from my phone, it's way easier for me).
One thing the daughters could do, if they knew what bank she had accounts tied to, is ask the bank to begin sending paper statements to whatever physical address Jin Fang used to open the account (if they know that address, they can then get information from the paper statements). I believe every woman should have a trusted relative or friend with access to her banking accounts (in my case, it's my daughter as well as my husband - as usually, husband and I travel together and just the difficulty of laying hands on cash, should anything happen to us, would be much eased by my daughter's access to my savings account).
And I will say I never thought about such things until I hit the age of 50, and even then, was pretty lax. Being here on WS has changed that. WS is doing great public service for all of us, by allowing us insight into dangerous situations that all people face, but which women face differently than men.
A key thing to find out would be to see if anyone had made a major withdrawal (or series of withdrawals) from the account to which her ATM card is attached. If she truly didn't have digital access to funds, I find that astonishing, but it would still be useful information.
Here's a picture from the Roadrunner Park. There are lots of others. If Jin Fang had looked through these pictures of Morongo Valley and area, she might well have thought it had the beauty of an exotic place. You can see more on maps.google.com of course.
IMO