I would stay very observant for now...if there was any bleach smell left that irritated your one snake's respiratory tract, that should subside (assuming it's gone now?).
Vets are like many other doctors...if you ask they might prescribe an antibiotic that isn't actually needed, which could be worse than doing nothing (by making resistant
germs & negatively impacting their digestion). Just make sure your temps & humidity are correct. Stress negatively impacts a snake's immune system (ability to fight
off disease) the same as it does for humans & other animals...if she is stressed now she might well be happier with a more familiar set-up.