It's not that she couldn't, but you are constantly told that if she doesn't play year round, it's going to be tough to play next year and the year after. So yeah, the option is there, but everyone involved with soccer tells you what a bad idea it is and how tough it will be to get playing time.
I know all soccer people want to bash the rest of us for being the bad guys, the idiots who don't appreciate soccer and therefore hate it. Honestly though, I've found the exact opposite to be true. Most parents, coaches of other sports are pretty open and understanding that if a soccer game conflicts with a practice in another sport, that you will be missing the practice. Soccer on the other hand, I'm constantly told how bad it is to miss any practice and she needs to make up her mind on what sport she wants to play, how much of a disadvantage she's at by missing a practice for a Basketball game, etc.
I find most soccer people I have to deal with, being outrageously defensive of the sport. So much so that they seem to think every other sport sucks and only soccer matters. Granted, this is my little world that I live in here in Schaumburg, IL, but I'm not the only one who calls the SAA Soccer officials and coaches "The Soccer Nazi's"
I just feel if soccer were really trying to attract people, they should make it easier to be involved with, not harder.