What is KIK and can someone else create or edit it for you without you knowing it?

A friend of mine recently discovered her 12 year old daughter loaded the KIK ap on her Ipod after being told she couldn’t. She has also seen some very inappropriate and vulgar messages coming to her. She is claiming someone else set up her account and put vulgar content on her account which is the reason why she’s getting all the unsolicited attention. I’m thinking shes fully aware of what she’s doing and is trying to avoid getting in trouble. Neither of us know much about KIK at all. Anything you can share is much appreciated.