D3T0M4

I'm new to "hacking". I was wondering if there was anyway to control someone else's computer remotely without them knowing. My ex-girlfriend has all of my credit card numbers (and info) on her computer (we both used the computer and i had them on their for my records) and I believe she's spending money. i dont want to get her in any trouble with authorities nor do i want to cancel the cards. I just want to go into her computer and delete all the files that have my personal information.