Someone is stealing money from my credit card?

My mom has had Android Galaxy phones for awhile, recently she changed to an iphone becasue she broke the Galaxy. She's been receiving emails about Google Play saying someone has bought games and such. It's been going on for about 2 weeks, we thought it was my little brother but we hid everything and now she got another email saying someone bought something on Google Play that was $24. I want to know if there's any way to take my moms credit card number and account out of the other devices and how.

A simple call to your bank will end this.
Call the bank

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