See, I don't know that I agree with that. For events where countries compete nationally they do select from the best athletes avaliable rather than a team devoted entirely to the sport year round. Since there hasn't been a tournament in game, that is easily explained away.
I know Katie was on the Irish national team, so that creates a problem but overall it seems like a random thing because that isn't how it's done professionally. Outstanding players are selected for the teams, and then other players are "called up" if injuries or dismissals happen and everyone plays in the national team as a bonus for being on a separate team and excelling rather than being employed by the "national team" that only actively plays every three years.