I'm thinking if we go with a motive of the need of a quick cash infusion (as opposed to the goal of getting hot goods to offload- taking more time and having higher risk of getting caught) ...the scenario might be this. The big fight just prior to could have revolved around some emergency cash flow need they had -CL/AL. CL, not having a criminal background might have put her foot down and told him HE had to come up with the cash, "get a job"! Giving a small benefit of doubt to the local newspaper editor who reported AL stopped by in response to the ad for help needed and got an application (just for a minute lets pretend that was not a fully fabricated story!)... He may have made some half-a$$ed gesture like that to appease her order to try to get a job, showed her the application but in the background already be scheming his next move. AL, by trade more of a theif and con man than anything else, may have decided to up his game one notch by trying a ransom situation and calling upon a "friend" to assist, hence the rich realtor scheme set up....
Let's say CL is still unaware at this stage. AL and tall skinny dude in grey truck set out to pull off the caper and right up front something doesn't go as planned ... We can't say what yet, but plans go south, very south. And AL and accomplice had no effective Plan B to resort to so frantically scramble to cover up and invent as they go. Somewhere in here AL needs CL to assist in the cover up and new plan. He cant hide it from her anymore. She's his wife and sees what a horrific mess he had created for her, her family, etc and everyone and rushes in to try to fix it before it's too late, not knowing she is dead or dying.... Maybe the ransom was requested maybe not, maybe the whole thing fell apart early on and they never even got to that stage. We can't know yet.
All hypothetical conjecture and NOT at all my original theory for motive since I'm still holding out on a possible outcome of AL being hired hit man by a 3rd party to scare her, rough her up, get something else from her. But with the ransom now listed as a distinct possibility .... This might fit. ?? Thinking out loud only.