Do you know what she was eating before? Was she eating live or f/t? Was the pinkie you offered live?
Most of the smaller few week old BPs I've gotten were feeding on hopper mice when I got them. Two of them I recently had to offer live hoppers to get them to eat. Hoppers are a lot more active than pinkie rats if you were trying a live pinkie. It can also take a little while to get them to start eating. I have one BP that wouldn't eat until her 4th week with me and then the other two I had to offer live to I've had for about 2-3 weeks now and they refused f/t hoppers twice. Double check that your husbandry is correct, leave her alone and try to feed her again in a week, and try to offer her what she was eating before you got her.