Open Question: How can I ask Zynga to ban my IP address?

My sister is addicted to Zynga games and I want to make it so she cannot play them. She is 26 and barely has a job. She spends 7-10 hours a day on Zynga Games. It is for her own good. Just as with gambling websites there should be a way to request that access not be granted. How can I do this?