Two months ago, after flirting with a handsome Ojibwa who poured stiff Margaritinas, Fonda tottered over to the slots and maxed out her credit card, setting her back two grand. Which is why, heading south on I-31 after an afternoon wine-tasting in Traverse City, I’m surprised when she tells us from the back seat that her inner voice just whispered: Twenty bucks will move your spirit toward prosperity. Since her heart bypass last year, Fonda’s been on speaking terms with her gut. “You know that ‘feeling?’” she says. “Well, I’m finally listening.”  “Did your gut mention how long you’ll have…