What I do find unacceptable is the way the OP was treated by CMs and management. There is never any excuse for eye-rolling and sarcasm from CMs and management - I don't care if they are dealing with a guest from you-know-where - they should not be ugly. In this case, they had a guest that was stressed out with very good reason, I would expect kindness from a McDonalds employee in a situation like this - and I'd expect much more from Disney.
I don't think they needed to be given a room quickly if that was too difficult to manage, or given free stuff - it's not OKW's fault that a family member got ill. It is, however, their fault that they responded to the situation with indifference, sarcasm, and rudeness. I think the OP is owed and apology, and I think whoever is supervising the CMs/management that were ugly to her need a disciplinary letter in their permenant file for their unprofessional behavior. If it is true that it was an actual manager that told her to "have a magical day", then that's a huge problem for OKW - because a manager that will treat a guest that way is going to be 100X worse to their subordinates and thus create a climate in the workplace that is anything but magical. Someone with such poor inter-personal skills should not be in management at OKW. JMHO.