If finishing top 10 at Worlds is a primary requirement, that leaves Alissa out and Ashley in. Of the other US ladies, Nagasu is next in rank, then Flatt, then Zhang.
If the 2009/2010 ISU Ranking data is purged and the 2010/2011 data is cut to 70% of its value before WTT, then the order is: Czisny, Wagner, Nagasu, Zawadzki, Zhang
If the 2009/2010 ISU Ranking data is purged and the 2010/2011 data is cut to 70% of its value before WTT, then the order is: Czisny, Wagner, Nagasu, Zawadzki, Zhang