Disney's product (though not their core, I would argue) allegedly killed this poor woman - however it is the lawyers' behaviour, not the death itself, that is an additional PR liability for Disney; death from an allergy is tragic, but could have potentially happened at any restaurant in the country. Only Disney (and a select few other large corps) could pull this particular bad act in defence.
As an aside, the entire line of argument from Disney is an absurd legal fiction. No reasonable person reads terms and conditions, and so they should not be bound by the terms. I hold a weak hope that this case is bad PR for the practice as a whole that raises the profile of this injustice.