I don't think she ever said that. As the secretary of state she didn't say who she voted for and as secretary of state, she congratulated Obama on his win. She went on to say that she thought the fact that the country could elect an African-American was a sign of progress, but she never actually said she voted for him, so far as I know. You can make your own guess how she voted, but it's not a proven thing one way or the other.
Condi is a very intelligent woman. I imagine she is quite sad at how inept the ‘first black pResident’ has been. I think Condi loves America, so she can see clearly that L4B does not.