Movie Theater Seeting?

Lydia likes to push buttons on the DVD player while Grace is watching movies so I thought I could solve the problem by putting the ottoman in front of the TV and DVD player. It worked, Lydia couldn't reach the buttons. But Grace promptly put her chair on the ottoman since it was in her way. She told me she couldn't get down because it she now she was as tall as Tinkerbell. (I don't think she was even watching Tinkerbell).