I built a playpen out of cardboard and didn’t think she could get to the duct tape. Well she can, I had to stop her so is there a safe tape I can use instead. The duct tape is on the outside of the playpen. This is what it looks like. She gets to it where the fleece is draped and low corners.
I don't know of any safe tape, but what about gluing strips of fleece to the cardboard to connect it instead of tape or just glue it on over the tape so it's not accessible.