What is proper feeding time/schedule for a tarantula?

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I have had a Chilean Rose for 6 years, and have fed her at random for six years. About every 2 or 3 days I would take a cricket and feed her. She usually eats, and has gone several weeks without eating. She has molted a few times, without a specific pattern to the time between molts etc. About 1 year ago she slowed down her eating, hardcore. I responded by feeding her less often since, she would practically let crickets die in her habitat, before even trying to give them the time of day. My question stems from the concern that my spider may not be getting a steady feeding schedule, or regimen of food. I would like to get some info on, other people's feeding schedules, if any.