The problem with the US women in the 800 is that there are really only 2 spots available at the Olympic Trials. Athing is going to run out front by herself and the rest of the women will let her go.
The US has something like a dozen women who have run 1:58 or faster. Being in the top two of those dozen women is going to be very difficult and it may come down to a little good/bad luck at the Trials final such as someone getting boxed in, or tripping like Akins did a few years ago, or getting stuck on the outside the whole race and having to run extra distance.