Thanks @1113sandstar for the fourth fact and @Snowbell555 for the last!
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-Willow Tail was named after one of Kate's cats.

-Originally, Vicky wanted to turn Midnight into the "ultimate baddie" but her editor, Erica, talked her out of it.

-Vicky would like to visit Russia, Finland, and Japan because she favors cold places.

-Holly's family stayed in WindClan after Grey Wing died.

-On page 226 of Dark River, it says 'nuzzle' instead of 'muzzle': "she pressed her nuzzle against Lionpaw's cheek, then trotted away toward her tunnel."