Computer Mix up.

I have our wireless network set up for no file sharing between mine and my Wife's computer because she does all our Banking and stuff on hers and I go almost any where. I have never set up the one drive app but all the sudden all my files and photo's( several hundred) showed up in her control panel. First any idea's how this happened and how do I get the stuff off her computer and not lose them on mine. My Wife is paranoid about using the internet any way and she is driving me nuts asking " How did this happen!!) Help please if you can. OS is Windows 10 on two Dell Laptops and NO I don't want to change it to anything else :)