This article says it was a short, 2 mile hike to and from their trailer (RV/camper, shown in the video behind her husband when he was interviewed posted upthread) that was parked next to the road, not some long hike into unknown territory nor from a campground:
"
Thomas’ husband, Robert, told authorities that the couple had driven their camper to the area on Friday and embarked on a two-mile hike. He said they were on the return to the camper when he stopped to take some pictures and his wife continued toward their destination.
He said when he arrived at the camper a few minutes later, there was no sign of his wife; the camper was still locked. He said he searched the area and, unable to find her, called 911.
[..............]
Thomas reportedly did not have a cell phone with her nor did she have any supplies, such as water. Daytime temperatures in the area have exceeded 100 degrees each of the last four days."
Search continues for missing Bullhead City woman
IMO, at this point with no other information than what her husband has stated, no sign of her at all or of foul play, and thinking of Occam's razor, I would posit the simplest explanation for BT's disappearance in a remote area alone with her husband on a short hike offroad in the desert and the heat without any supplies, is uhhhhh.... her husband is the only one who knows of her whereabouts.
No one but her husband can attest to when she was last seen or heard from, what she was wearing, drinking, or doing. I agree with other posters who wondered if she was ever even there, or if her husband has sent LE on a wild goose chase out in the desert.
So convenient for his story that she had no cell phone, no water, it was super hot, he stopped to take a photo and it took 'so long' that she went ahead without him, and he let her do that and let her get out of sight, etc. without saying "hey honey, hold up a minute, let's stay together" or something along those lines. Oh, and he claims she was drinking a beer. Oh, and that she was wearing a bikini (although one MSM article said she was wearing black shorts with a bikini top, not hiking in a full bikini set), which all seems like it's made to sound like she was a little off and being a little risky, when IMO he was a little not a competent hiking companion or careful with making sure his partner was safe. This behavior seems contrary to his statements in MSM that they 'often' took their camper to go take hikes in the desert, implying they knew what they were doing and it was just 'usual' behavior for them.
This is all JMO, and I could be and hope I'm wrong and she is found safe around there having fallen or become disoriented, and I will eat my words if so, but after reading all the MSM articles and posts here, my hinky meter is going off, especially after watching the interview of her husband. He kept covering his mouth and stuttered when he spoke about when he 'lost sight of her around the corner'. He also was ready right away to give them his theory saying in the interview with MSM that she must have been taken by someone when crossing the road to get back to the camper, and was maybe in Las Vegas??
IMO LE has not issued the Silver Alert because her husband is the only person who has a story about what happened to her and where she might be. and they are focusing on searching the area where he says she disappeared, and don't have reason to believe she could be elsewhere where the public could be on the lookout for her.