Hello, I have gone through your query and understood the concern. If she is not yet expecting her period, this spotting could be a breakthrough bleed which happens when there is not enough hormone supply to balance the endometrium. An implantation bleed which can be seen at the time of the expected period is a fresh bleed, can be seen for a couple of days until a week and is not brownish, which is a result of old bleeding. In the current scenario, I would ask her to stay in bed, observe and report the matter to her health care provider. She would need a pregnancy test and a sonogram for further management. Hope this helps.