My question involves child support in the State of: California

I knows this question it's asked often, but my grand daughter is refusing to visit her father. Visits are ordered to be monitored because of previous abuse. He has no legal custody, not medical even. He is permitted visits as often as he can obtain an appropriate monitor. She is now 13 and does not want to be in the same room with him. She now lives in Ohio and only sees him when she visits me each Summer. He does not contract her at all the rest of the year, not even on birthdays or Christmas. Must I force her to visit him?