I’m not super committed to this…but we know nothing about her and the only thing we know about her is she didn’t love him and left when the money was gone. I like fiction, so I can fill in the rest:

She obviously “dug her gold” long before he was 69. She was a meth head…10s of thousands was like millions to her. It’s Florida, after all. She married a moron in the first place, she’d been stealing his money for years. Him being stupid wasn’t surprising...it was just a pretext for her to bail and take half of what was left because, with no cash, there was no point in staying.