I've been trying to lose weight recently (Currently 5'8/160, trying to get down to 5'8/130) and I have a restricted diet of 1200/day. I was eating so much more than I thought before I started strictly measuring. I only do cups/tablespoons/measured amounts on packages (1 slice, 1 ea, whatever) because I don't have a reliable weight scale. But from my own experience there is NO WAY she's only eating 400 calories a day.