Being a single parent with a child with SEN and physical disabilities would be really tough for anyone and KP is no exception.
I'm sure she is entitled to, and in the past has afforded, respite care. No one would begrudge that. She has also been on holidays without him.
Obviously she has been his primary carer and the person who knows him best but even before he was in residential care he had had other people caring for him when she was working or having respite. It's not as if they have never been separated