Magical Mayhem Series by Emily Martha Sorensen

The villains are dead.  The world is at peace.  And now the magical girls want to conquer it. Chronos has the power to see the future, and that's the future Chronos foresees.  All she wants is to get a good night's sleep, so she decides to have a simple conversation with the fated ringleader in hopes that it will set that horrible future straight.But Kendra is not an easy person to convince.  Kendra wants to save the world.  And if she has to cram that down the world's throat, well, so be it.

Chronos doesn't want to be a villain. She also doesn't want a houseguest.  Unfortunately for her, Kendra is insisting on both, and the former magical girl will not listen to reason.In desperation, Chronos goes to the one person she trusts least for help:Her sister, Rhea.Rhea, who is a fashion designer for villains.  Rhea, whose favorite hobby is corrupting magical girls.

When Kendra defected to villainy, she left her friends and family baffled. Her best friend has no clue where the former magical girl is or what she's doing, but she's determined to find out.Even if it means attacking Kendra.Chronos has a brand new unwanted houseguest she can't get rid of.  And this one has more than a few screws loose and is adorably evil.  What do you do with a ten-year-old dark magical girl?

Kendra has her first assignment: to stop a bully at a school for magical girls. But she underestimates the language barrier, she overestimates her own competence at villainy, and she's not used to fighting without magic.So attacking an entire school of magical girls may not be the wisest thing she's ever done.Especially since a villainous fashion designer is watching.

If Rhea's sister is a traitor, she knows what she has to do. She heads to the lair ready to do what's necessary . . . and clueless Tiffany lets her in. Chronos is not delighted. One of Kendra's friends finally gets what she's wanted for a long time. But will it be a dream come true — or will it be a nightmare?