you need to look at the environment its kept in- is it hot enough, is it stressed, enough space but not too much....etc . if a snake has had a period of cool, it can take weeks to return to eating. heat is important. do you know what it was eating before? is it otherwise well/ i got a snake off someone and it stopped eatin, had a wheeze and turned out to have a respiratory infection. probably kept too cold. there is lots on this site about snakes not eating, if you look.