Not acceptable, I've been there and I told my dd she is not allowed to quit. She doesn't have to play next year but you made a commitment finish the year. What are we teaching our kids when the going gets tough just quit.
Not knowing all the FACTS...I would say this is middle school or non varsity ball since they are struggling to get players.
Anyhow, the quotes from 1950/1960s while classic and good, do not mean much for most under 40 in todays sports environment. I have to shake my head when I see post like, "I would make them finish what they started" especially; when its someone elses kid...
I have no issues when one is critiquing their own kid but there is a lot of those that live in a glass house and throw a ton of stones... (My old quote that gets over used)
I know of ladies that had to leave a team at all levels for various reasons and guess what...They are doing ok without the doom and gloom or end of the world for player and team that posters like Heavy Hitter seems to forecast.
The bottom line is, this kid may not have the support needed coaching or parental, she may have actually NOT wanted to play but did because she was pressured by her friends, she may have been a solid player and hung her team out to dry just to do it..
This case just has too much information not known to form blanket statements ...
I do not see a person leaving a youth sports team causing them down the road to leave jobs, relationships, families etc ...