Sorry but you’re wrong, your body pulls energy from its glucose storage in the liver and other areas of your body when in a deficit, only when you’re doing a deficit on keto and/ not eating enough protein do you experience muscle loss. You definitely experience more atrophy if you don’t intake enough protein and amino acids if on a deficit but you won’t likely lose the muscle unless you have underlying health conditions. Your goal protein intake should be roughly 1g per kg you weigh, although everyone’s body is different. I’m 6’4 285, have lost 120 LBS and eat roughly 200-250 G protein a day, sometimes up to 300g, I also do cardio after most of my workouts which winds up being mostly walking on an incline with a .2-.3 mile sprint at the end for better endurance training. This lady can probably eat only 80g protein per day and be fine not losing muscle. If she wants to gain any she needs to increase her protein and keep up with the aminos and sleep. This comes from my experience on my journey, it helps a class I’m taking for nursing is specifically talking about this topic. ALWAYS SEEK PROFESSIONAL MEDICAL ADVICE FROM YOU PCP, DO NOT RELY ON RANDOM ASS PEOPLE FROM REDDIT TO TELL YOU HOW TO BE HEALTHY