I just found out that one of my former players quit her women's college soccer team a few weeks ago, during the spring season (I'll keep everything anonymous for purposes of objectivity).

In the 8 years that I coached varsity high school soccer in SC, I had 4 girls sign Letters of Intent to play D-II College Soccer. 1 girl quit the first week of pre-season, one girl played for three seasons (and for two different coaches), one girl quit before the season even started during her freshman year but decided to play her sophomore season, and the latest girl quit during the spring of her Freshman season (after being 2nd on the team in scoring).
NONE of the four girls that I coached played all four years at their respective school.

How common is this among female soccer players who decide to play in college?