Asking a girl to scream all night long over and over, I think an electrical device with just those recorded screams should be made available for her/them. Push repeat and it is already reset, she "Screams" again, and again, all night long.
No pain no discomfort no problem.
The sweety little woman retains her sweet little feimine voice for us to enjoy.
I mean, would we ask someone to Bleed all night long for a haunted venue?