I'm willing to believe the abortion story...but it might not be from an affair. If you were so career-minded...you might see this as a major hinderance. The fact that she married 10 days prior to the trip...and she might have been 4 months into this...which would have made it a absolute "no" in any western women's clinic...might explain why she was out of it for three days. A normal women's procedure (kind words to use)...would have taken three or four hours max. She would have simply had a "lost" epiosde in town, and came back to post a bit weak...but no worries. If she shows back up in the states...four months preg...the husband is happy and life goes on. I'm thinking that she really didn't have too many ways of fixing her issue and came to the conclusion that hospitals in Bishkek were safe enough. And as for cash...probably $500 would have easily made the doctor very accepting of a late-term episode.
Wasn't she also hot on doing marathons? I think she had some upcoming obligations to run in an inter-service marathon and maybe the pregnancy was with her fiancee/then husband, but was "inconvenient" with her sports career.
Also perhaps it was supposed to be a "simple" procedure that went not so well, causing her to be gone longer than she originally planned.