The phenomena is called parthenogenesis, and has been recorded in other snake species, although it is extremely rare. I'm not aware of a for sure occurrence has ever been recorded and 100% confirmed for ball pythons, but hey you never know. Other options may be the retained sperm as previously mentioned, or she may have an extra special poop for you (yes, even if she already had a bowel movement).
If you're really suspicious of eggs, you could try to palpate her for follicles (you should easily be able to feel them at this stage if she's visibly fat) and watch for other building/ovulation behavior.
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