My daughter age 9 is always sub at matches. Weirdly she always used to be good at sport but after being sub with 1 other continuously has dropped behind the others. Bit annoying as matches take up all Wednesday afternoons. So as usual today she played for 10 mins then sat watching. Fair enough though though they want to win.
However, they do training/ PE on 3 other days and she also has to “sub” in these practice games. I spoke with the teacher who said that the other girls don’t like certain positions so not always possible to rotate players 
I understand in matches —although don’t like it and want to moan— but shouldn’t she be getting equal PE time? Independent school if that makes a difference?
Surely it’s like those weak at maths just watching stronger students do the work?