According to US Soccer, Abby's injury yesterday is relatively minor: http://www.ussoccer.com/articles/viewArticle.jsp_2162693.html You may now resume breathing and/or clean your shorts, as necessary.
Whew! I think she would have battled to stay on the team no matter the pain. She's one tough girl. Great news for wombat and the team!
I think you have to assess the situation: Playing North Korea in the World Cup: gut it out. Playing a meaningless friendly two weeks before you have to play North Korea in the World Cup: don't risk making it worse.