I've been down this road a few times. Most D1 women's soccer programs have 12-14 full scholarships available to them. Most D1 college women programs carry 25-30 players. They have to split the scholarships up, or count on several girls who want to walk on.
Had a visit with one college who didn't have any scholarships available for field players in 2011, they had to reserve the scholarships for goalies, because they were losing their goalies to graduation.