It's not good to assume. There could be something other than a pulled muscle. Cats hide pain very well, it's a built in instinct. If it is a muscle injury, depending on what kind it could take months to heal.
If it lasts more than 48 hours without improvement I would go to a vet. Cats heal fast if they are going to naturally (they have to in the wild) and she may have a hidden abscess or something in her paw pad, apart from the possibility of muscle injury.