Great news! I don't want to burst your bubble, though, but to be absolutely sure she is actually a "she" you will also need someone to probe her. Popping is fairly accurate for newly hatched balls, but is gets less accurate as they get older since the males develop more control over the muscles that correspond to their hemipenes.
Popping is only accurate to determine which snakes are definitely male. If a snake pops hemipenes it is a male - no questions asked. However, if it pops as a "female" it then needs to be probed in order for you to be confident.
Ask around on any of the snake related forums and I can guarantee that nearly everyone has at least one snake in their collections that was either sold to them as the wrong sex or that they raised themselves only to find out 3 years later that "he" was a "she" (or visa versa). Unfortunately, sexing snakes is never 100% accurate - don't believe the hype -even experienced breeders make mistakes.