Millie's still got a bad paw

Millie's paw still hurts today. She is still licking it and when she jumps on the sofa is only landing on her right leg. She's been limping a little bit too. I'm not sure what it could be but it seems like a thorn may be stuck though I can't see or feel anything. We haven't done any training or much walking to try and make her rest it to see if it makes any difference. Hopefully it will be better soon as it's not nice to see it hurting her!