Well I hope the vet can figure out what is wrong with Lucy and not try and rip you off. My first Albino boy died from starving himself to death, Vet told me nothing was wrong with him.
So I guess he died from stress/starvation, ever since this even after having BPS for over 2 years I get freaked out when they don't wanna eat.
Also you said this is a class room pet? Are you a biology or science teacher? Either way its really cool that you are teaching the young how reptiles deserve to be pets to!