For me it is nearly impossible to explain the feeling. So if I said to someone I want to go home (meaning I have an empty feeling I cannot describe or fill) and they responded “you are home” the next thing for me to do is just have a weird expression and let it be. There is no way to explain it and if the person indicates they don’t understand there is no point wasting precious energy trying.

The feeling isn’t pain but it hurts so much that people kill themselves to relieve it. 

I don’t know what your daughter is experiencing, just my take on it.