Aren't babies fun!?!? With small BPs, it's mostly about them being comfortable in their environment. You said you brought her home, stuck her in your snake rack with a hide, and left her for 5 days. How big of a tub is she in? What kind of hide? What kind of substrate? How was the breeder keeping her?

Here's an article with lots of good advice as well: My Ball Python Won't Eat!