10 year old sister in the hospital

My little sister is 10. She’s 4’6 and yesterday she was 48 pounds at the hospital. Shes been eating less and less but over the last week when my parents started to try and make her drink nutrition drinks she suddenly stopped having basically everything except water and then when she started refusing that too they took her to the ER. She kept saying she thought people were putting things in her food. She’s been so bad in the hospital that they’re giving her meds to make her stop fighting them. My dad said she’s not going to come home for a while because her kidneys were injured from what she was doing and her heart rate was 39-42 when she lays down. She’s getting things in an IV now but I don’t understand why they’re not making her eat or giving her a tube in her nose. My aunt had a tube in her nose when she wasn’t eating. I guess what I’m wondering is, first, how bad is this? She’ll get better right? Second, why aren’t they making her eat when she’s been there a whole day? Third, when she comes home will she be normal again, like can she get all the way better since she’s so young?