Meepcha and the Lost 100 by William S. Russell III

Soot, ash and cinders the fire burns brightly but something always remains behind. An ancient and formless evil was released during the battle in Nova City, an evil that has found its way to earth. One hundred of the mysterious automata, the Ergasi, are missing as well. Without their care Nova City will be doomed to drift in space forever. Now it is up to young Gracie Fisher, her feline guardian Roscoe and their companions Dondo, Bear and Mimyat to set things right, and to somehow reunite Mimyat with her long-lost twin sister Meepcha along the way. Mepcha and the Lost 100 is the exciting sequel to Chermpf, and is the second book in the Cats of Nova series.