I think this is going to be a tough one to get all the correct translations for out of the gate, the English language has a lot of way to say these things.
Would "She plays the game well" be an acceptable translation? Or would the noun class be different for "mzuri" in that case? What noun class would one use when using an adverb instead of an adjective?
Is "goodgame" a word?
I wasn't able to find it in Oxford English Dictionary or AHD, I think it's a typo. Reported.