She's probably fasting. Don't worry about her. Weighing her regularly is great, just keep an eye on the decline. I'd say if she loses much more run a fecal test. My big girl hasn't eaten more than a few mice since October. Happens every year.Last year she went four months, now it looks like she's going to beat her old record. Breeding season fasts are perfectly normal, as long as the snake is healthy and hydrated.