unauthorized purchases by 4 year old grand daughter

I'm embarrassed, but not enough to ask for help.  My 4 year old grand daughter got a hold of my tablet while I was sleeping and made unauthorized & expensive purchases on my candy crush soda saga game, that also cause a fraud alert to be sent to me that I discovered this morning.  I know she didn't understand what was happening as she kept pushing the pretty & bright colored buttons.  These purchases were made back-to-back within a shot period of time and totaled more than $60.  Help me remove these charges please!