My firefighter-loving child really likes "Molly By Golly," the story of the first female firefighter in 1818. (She was working as a cook in the firehouse, but joined in with the men during a flu epidemic and continued to work with the crew fighting fires after that.) http://www.amazon.com/Molly-Golly-Williams-Americas-Firefighter/dp/1590787218/ref=sr_1_1?ie=UTF8&qid=1399260893&sr=8-1&keywords=molly+by+golly
Book loving, editor mom to 2
This book shows both a male and female firefighter: http://www.amazon.com/Firefighters-Sue-Whiting/dp/0763640190/ref=sr_1_8?s=books&ie=UTF8&qid=1399330991&sr=1-8&keywords=firefighters
We requested a different Peppa book, since our library didn't have the fire one, to make sure she likes the series before making a purchase. I think the Molly book will be great when she is older.