3/4" plywood was nailed down on top of the old carpet in the mobile home. My mom is elderly and keeps falling because the walkway into the living room isn't nailed down into anything. Theres nothing to nail it into there. The plywood keeps popping up when you walk over it and there's a gap there between the pieces. Any suggestions? We were told if we tried to put anything over it like a rug it wouldn't help?