How can i get my bank card off my apple id account

how can i get my bank card off my apple id account. i have recently found out that money has been coming out of my bank account that im not spending, we figured it is a glitch in between the ipad that me and my grnddaughter have. she used her apple id on my ipad 3 when i first got it and then i changed it over to mine but then she got a ipad 4 adn started using her apple id on it but every thing she buys or her friend that has used her account but got off of it and then bought stuff off of their own account, but for some reason everything they buy on there accounts money comes out of my bank account because she used her apple id on my ipad and then we switched it over to mine........ so some one please tell me how to get my bank card off of my apple id account and how to possible try to get my money back.... because it has took 80 bucks out of my bank account for 2 months and i cant afford that its to close to christmas for this so please help me..

iTunes Store: Changing your payment information
http://support.apple.com/kb/ht1918
iTunes Store Accepted Forms of Payment
http://support.apple.com/kb/HT5552
 Cheers, Tom

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