Just had another thought on what might have happened... if she had started with what she thought was a full bolt and based her "number available" on the yardage printed on the bolt... well, we're frequently finding that we come up a half-yard to 3/4-yard short on our bolts. Meaning that there isn't quite as much on them as the manufacturer states. But it isn't worth the bother of unrolling and measuring them all... so we just sigh and move on.