My daughters end of year 6 show

My daughter came home a few weeks ago and said" mum i've got to audition if i want to be in the end of year 6 show",ok i said. A few day's later my daughter came home from school very low ,i asked if she was ok ,she started to cry "the teacher said there are too many words for me to remember,so i havn't got a part ,most of the year five's have part's." .................. my thought is,  being it is year 6 show then if children want a part or want to audition then they should be given a part suited to their level of needs time and time again she's made to feel like a failure.......................this should be a  happy time but not if she feels she's not as good as others and doesn't see her self as a success .......................I don't want this to continue in sept when she goes up to secondary school .has anyone else experienced this from main stream school.