Player make up on a team will vary depending on the overall skill level in each age group. If there is less disparity of skill level (strong to weak), teams will be mixed and players moved around more often. If there is an obvious disparity in skill level, teams will likely be set and players will play with that team throughout the year.
Athletes can move from one team to another at any moment depending on the needs of the team/club. The expectation is that athletes will play on any team without hesitation and put forth their best effort. The team skill disparity is subject to the opinions of the coaching staff.
The overall goal of the coaching staff is to put the player wherever her talents will be showcased. Players are not moved from one team to another as a form of punishment.