How to control my little cousins laptop with my laptop? Please help Dx?

My little cousin dell inspiron, and she has been watching suspicious stuff, and every time I check on her computer, she has malware, spyware, viruses and all that, I ran a quick scan with malware bytes, and found 199 threats using quick scan. I want to control her computer using my computer, how do I do that? I want to monitor her activities without her knowing. Please list some programs.