I do not have the iPOd touch in with me. I need to delete it from my Acct.

I was helping my daughters friend restore her iPod Touch and it now linked to my acct. of all things my Mothers Phone number. I told not use the internet and texting. She does not listen and just happy to have these abilities on her iPod. She's not my kid and I do not want to pay for her stuff. I need this device off my Account now.

Someone please help me.