My main concern would be adaptability. While 800 cal/day would be okay for the short run, I wouldn't want my body to adapt to that and make adding more calories something that leads to weight gain.
To each her own of course, but I'd be adding some ruminants, liver, and oily fish. Your ratios look PHD perfect, so you could also just eat what you're eating now, but increase everything by amount.
ETA: most of my tweaking will be exercise.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine