Find something she loooooves. Small slivers of real meat often do the trick. Something she'll do ANYTHING for. Teach her to play tug-of-war by putting a rope bone in her mouth and giving her a top shelf treat for holding it in her mouth, then graduate to longer holds, holding while you pull, and finally pulling back. If that's what you want her to do, you could train her to play games with you just like you teach any other trick. Some dogs won't play by themselves. My husky didn't play with toys until we got the GSD, who will grab a toy and tease her with it, then drops it in front of her and beat up on her and rams into her when she sniffs it. Just like children, some need a friend to get them in "play" mode.

If I were you, I'd be ecstatic to have a lab who is less likely to ingest a foreign body.