Lock her in the secrect room in the celler.

From Create Your Own Story

You keep control of your instints, "Listen, my mom and dad will be returning soon. You can not be here when they arrive. Come with me and I'll take you to a secret room in the celler that only I know about." The babysitter takes you hand and you lead her to the celler. Once there, you open the trap door and chained her in there. "Now, they'll be here any second. once the car drives in, I'll close the door. Don't make a sound until I open this door again, ok?" she gives you a nod.