But surely 'the best actress who turned up to the audition' will only turn up to the audition if *the character created by the production team* is a good-looking able-bodied woman in her mid-twenties. Had the script specified a fat Chinese bloke with Down's Syndrome and one leg, a different set of actors would have showed up.

So it isn't fair to attack this actor for taking the role, but it's certainly fair to see her as being symptomatic of a problem with the production.