I need some encouragment I feel like to give up?

I have a wonderful 21 month old daughter that I love very much. I know it not her fault the way she is.

I feel like I don't know want to do anymore or want else I can do for her. My daughter been failure to thrive since she was 1 month old. We gotten a second opinion on it and still stays the same. My

daughter has a feeding tube that she is tube feed at night. This helps her to gain weight. She doesn't eat enough food to get her to gain weight. My daughter is very active toddler.

I try all the things I could think of to get her to eat and gain weight. The doctor wants me to add a lot of butter to her food to make it higher calories. I have done that and I stop because I am tired of it.

I work with her to eat and let her feed herself but doesn't change a thing.

What else I can do. I know putting butter with vegetables doesn't taste to good. I know it does with corn but not green beans or carrots. How can I get in to a routine to keep adding butter to her foods. Also the mention sour cream and olive oil to her foods.

My aunt says to feed her every two hours. If I do that I feel like I don't have time to grocery shop and laundry mat to do my laundry if I need to feed her every two hours. Also a lot of people say do a routine that have same time feeding has well. I have two older children that needs attention and help with their home work. I am living with my boyfriend but these are my kids. He not the father and it bad enough he has to deal with his 9 year old daughter that behavior issues.

Thanks