I experienced and experience the same symptoms as your mom Michelle. I started losing weight and I didn’t have it to lose. I continue to struggle with fatigue and trying to maintain the 89 lbs I now weigh. I used to weigh 105. My docs told me the same thing regarding regaining my strength and hopefully putting on some weight. Was your mom on antibiotics while in the hospital? The antibiotics destroyed my stomach and I now have SIBO and am fructose intolerant which makes it even more difficult to eat. If she doesn’t have SIBO there are healthy diets that can help her hopefully gain weight. I will keep your mom in my daily prayers.