One of the things I found very interesting I think in the lead up to the Olympics was an interview with Carol where she talked about the evaluation process of players for the pool and how much USA basketball followed the international play of the USA players - one of the positives she cited for Robinson was how she was leading her Euro team to great success.
Given that interest in not just WNBA production but also foreign play, I think Diggins lack of international play was a serious negative in her effort to make the team - add in then being missing from the camp due to injury ...