What does it mean if a perfect Christian is a liar and master manipulator?

There is a girl who seems to be a perfect Christian. She's born again meaning she didn't used to be Christian, but now she always volunteers at her church and believes in a 6,000 year old earth and gets all emotional when she's listening to a sermon. She also is a masterful liar and manipulator. She repeatedly lies with no hesitation or second thought, even about extremely small things.