How To Train A Cockapoo During Playtime?

My 8 week Cockapoo stays in a den we have made for her in our kitchen, 3 days a week. It is roughly 9X6 and blocked with a baby gate. We keep her crate at one end filled w/toys and tied open, her food/water in the middle (usually just a water when she’s alone– we feed her before and after work, with treats on lunchbreak if she’s good outside), and her potty place in front of the baby gate. She is confined here while I work, with my husband coming home on his lunchbreak for a walk/play period of 20-30 minutes. When I return home at night, I want to play with her. I take her potty, feed her, take her potty again, and then play time. Problem is, her definition of “play” is nothing but running/biting/chewing. I know it’s because she’s cooped up too much during the day. I want to give her play time and socialization when I’m home, but it’s really hard when all she does is bite and run around like crazy (sometime having accidents)! “No” doesn’t work; it just agitates more. Any ideas?