remote operation

Alright I know Iam going to get some Sh!# for this so Ill start off by saying YES Iam ignorant to computer hacking and Iam not looking to do anything illegal. However I am looking for a simple way to monitor "MY" other computer at my parents house.

Heres the deal, I have a niece whom lives with my 60 year old parents, she screwed them over stealing a car taking aderall and mushrooms and running into someone- then blamed it all on her friends, she was asked to leave but started the whole sob story crap and they let her stay, I put a keylogger on the computer I have set up for my parents and have been monitoring her activity, Basicly shes fucking my parents over again "no Surprise" Id like to take this a step further and really screw with her, Id also like to be able to remote monitor the computer and take it over from time to time, Since it is my computer I have access to it.
hope someone has some suggestions to help make her life miserable.
If anyone had seen those reality shows of the fabulous people in the hamptons, This is the type of person she is, shes a little prepy bitch.
Bill