I think you could give her a good amount more if she is 13 inches. My tiniest baby, who is about six inches long, eats about half that amount chopped into very small pieces. I feed her every 2-3 days. My bigger babies...who are about 10 inches, I'm guessing, eat two large worms between the four of them, chopped into bite sized chunks. Hermes, who is probably around 14-16 inches, eats a whole large worm chopped into bite sized chunks too. I feed the larger babies every 3-4 days and Hermes every 5-6 days with my other adults. I would probably give her a whole worm and chop it into bite sized pieces...it will be easier for her to eat.