Could be a broken or fractured toe? Or even a sprain?
Toe Injuries in Dogs | eHow
I wouldnt go as far as dog shoes, but I would definitely take her in for a Vet check. This is really a important growth time for a Lab. They grow so fast I would want to know if there was actually a break and how to handle it with her being a pup. And if it's a sprain, maybe "forced" rest is just needed.
Poor girl. Labs truly play rough. Hope Oakley is feeling better soon.
KAZ