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I would check her wheel and toys to see that there is nothing she can catch her toe in. Wooden toys can cause splinters and some wheels have a tiny gap between plastic units that nails can catch in. If the swelling gets any worse or if there is any discharge or pus then you need to see a vet. Infections in toes can travel up the leg.
It's usually best to rest the foot with no wheel till the swelling subsides. Pulled nails can take a while to regrow. Give other enrichment to keep her busy if you remove the wheel.