Pay a computer geek to write a program that will erase her hard drive if she accesses the computer during those hours. Attach the program to a photo of some cute puppies and send it to her email. Then tell her if she gets on the computer after 11, something bad will happen. If she disobeys you, she will learn a real life lesson - ALWAYS LISTEN TO DAD!
I love this suggestion.!
If she wants to use the computer again, SHE will have to deal with loading it with a new OS, any way she can, (at her expense, of course.)