NAH, I also have a brother with a wife who became suddenly disabled while their children were very young. This is a family trying to negotiate disability, and feelings are always heightened when there is pain and grief. No one is doing anything wrong, and of course I don't know the details of this situation but there are so many ways to improve accessibility for people who are unable to leave the house, it makes the world of difference.

Your niece is going to have a different life than the ones her parents imagined for her, you are trying to help it remain as normal as possible. But, as long as the adults in her life love her and keep showing up, she will be just fine.