By all means, feed her again! No BP, not even a newly hatched one, should be getting pinkies unless they are seriously malnourished. Hatchlings can handle hopper mice from the start.
As soon as possible, get that snake on one properly sized prey item every 5 days until they reach 100-200grams, then go up to every 7 days. Properly sized is usually measured by giving them prey that is the same size around as the snake is at its widest body point. This means that if the snake is about 1" wide in the middle, the mouse or rat should also be about 1" wide.
Generally, hatchling Ball pythons take hoppers or small adult mice, juveniles take medium to large adult mice, and over that it's either rats or multiple adult mice.
Oh, and as far as the poop thing goes... BPs can go weeks without it, especially if the prey they get is small. Don't be surprised if, even when an adult, your snake doesn't poo for a while.
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