Are the paws a brownish/red color? If so it's probably yeast. If she is chewing them raw even if you put her on the worlds best dog food it probably won't go away without some sort of treatment, because it is probably bothering her already. It could also be infected from her chewing them.
Putting on good dog food will definately help in preventing it from happening again- unless she is allergic to something that touches her feet (like grass). The yeast usually comes from her licking and chewing her feet, and the wetness gets trapped in between the toes.