Join Date: Oct 2009
Location: Just south of sanity
Wyoming, they do this with top earning stallions, so I'm not surprised they're doing it with her.
Since she's a breedable animal, she's worth more for the babies she can produce than the races she'll theoretically win.
Notice that geldings are never retired early. They race for a good number of years, because that's the only income they're going to generate.
It's a business decision based on income potential, nothing more.