What if...... WH had connected with AJ about money or whatever and he told her he had to go to pick up cash/whatever. If he had to take the ride then he probably would have wanted company as he was doing her a huge favor, leading them to the Franklin house. He might have gotten her to consent go with him under the guise of getting the cash/whatever. Although we don't know how she was killed, we do know that no blood was found at the hotel (no crime scene as far as we know) and, most likely, in the cars/trucks (not impounded as far as we know). If they were using luminol to process the Franklin house, why? My guess is that she had injury that would indicate blood loss of some sort. If so, then, the trucks/cars and hotel would have had blood material if it was WH who transported her or had her at the hotel with her death or injury occurring. He may have then kept her phone and cards and clothes.
i write cash/whatever because I am not sure that it would have only been cash that she might want from him.
Just a thought. Sorry if this idea was posted before. I try to keep up but.......there are lots of posts each day!