Chukky,
Perhaps I should have first welcomed you to JWN.
There is no question as to liability. Obviously if someone trips on a cord that is strewn over the floor, the property owner is liable. As a recovering insurance agent, I am aware of the legal definitions of negligence and assumed risk. It is my own personal opinion that suing for anything above and beyond medical costs when there was clearly not malice involved is not the right thing to do.
My sister in law is a personal injury attorney, and I understand how they make their money. By litigating. They keep about a third of any settlement or judgements. IMHO these are the people who have inspired a culture of suing over anything and anytime there is a good chance of receiving a chunk of money that will make it worth their time.
Again, I'm not saying the KH isn't liable, just that they shouldn't have been sued especially years after the fact.
I sincerely hope your daughter is doing well, and her health problems have been able to be treated and hopefully cured.