Degenerative Disease? Then why would she be saying please come back? Crazy stuff? Yes people do crazy stuff.
However having a potential terminal patient behind a locked door is almost guaranteed to result in death if something happens. By the time you heard the alarms, got to the door, unlocked the door, figured out what was the issue by looking at all the devices to find what caused it and then reacting properly to fix it, he'd probably be dead. Not to mention Bela doesn't carry around anything that would show her his health, like some sort of monitor or anything. She has no problem going to work, walking away from the room etc. etc.
I'm all for theorizing lets just try use game info to do it rather than wild and crazy what if's.