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It happens.
If she has low bodyweight to begin with it's more likely to happen.
If she was sick recently, that can be enough to throw things off.
Sometimes diet can impact it.
Either way, nothing too much to worry about for a single missed incident. If it happens more than once, or especially two or more concurrent periods missed, then it's time for a doctor's appointment.
Heck, she should probably go the doctor anyway. It's always good practice, pun not intended.
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