Cassidy, when you go hypocaloric, it doesn’t matter whether you’re eating 90% carbs. At about 800 kcal, even if you eat 90% carbs, you could be ketogenic if you’re active. That’s because this is a matter of clearing a hurdle, an absolute number, not some % of your diet coming from carbs. At 1,200, you could possibly avoid that. But if you ended up in starvation mode like you said you were, then it’s likely that amenorrhea and hormonal dysfunction arose from that deprived condition, which really is a disease state for infections, immunity and hormones.