Nothing I would say to her is suitable for posting. You don't owe her an explanation. If she can't figure out that being late and missing practice is reason enough to give another rec girl some reps then nothing you say will help her understand.
There isn't a font big enough for the AMEN I say to this...
I went back to 8U rec this year since DD is going to college in the fall...wanted to start over and stay in the game that has brought the family such joy (and heartache at times )...one and done (at least in rec)...I'm horrified at the entitlement mentality, which is exponentially worse (my perception) than 10 years ago when DD started...