She's a product of 'political correctness', a disabled comedian booked to 'tick s box', like the young disabled lad who won BGT a few years ago, and the autistic lad with ticks who just got to the final of BGT.
Personally, I don't find Rosie particularly funny, but she will have an audience that does. I can say exactly the same about Ben Elton - in my opinion, the least funny 'comedian' I've ever seen. It takes all sorts.
It's entertainment for the masses. That's why we have a selection of channels and an off switch.