Looks like Spence will be focusing on the 10k now and wants to prove she can run that standard on the track anyway:
"Actually, it fuels my fire to WANT to run the 10k. I see my goal of a mid 31 10k as reality for this season, but definitely plan on running and getting the mark… I want to actually earn it through a time that shows."
http://www.levelrenner.com/2013/03/26/spence-gracey-earns-an-a-at-world-xc/