I thought she might try a Kratochvílová and drop down to the 200.
Interesting section below from the ESPN account of the race--she could move up and not have to take any hormone-suppressing medication? She also ran a 4:30 1500m heat before the 5,000m.
"The IAAF wants female athletes with differences in sexual development to reduce their blood testosterone level to below a stipulated concentration for a period of six months before they can compete, to prevent any perceived unfair advantage.
But this is limited to events ranging between 400m and a mile, and so would not include the 5,000m, leaving Semenya free to compete unhindered in that distance. It does, however, rule out her primary 800m event, as well as the 1,500m race."
The race was at 5315 feet of altitude.
So according to the NCAA conversion, Semenya's time is equivalent to 15:36.48... So it wasn't exactly slow.