I am writing a YA novel where my MC's best friend (BF) has anorexia. Both girls are 14 years old.

This is a minor sub plot, but I still want to make it factually 'right'.

Over several months, we've seen the BF go from skinny to skinnier, and now looking sickly-thin.

I was thinking the first time that we see something seriously wrong would be the BF being admitted to hospital for dehydration. She'd spend a few days there on a drip, and comes home, for the whole process to just repeat over...

Is this believable?

Any suggestions appreciated.