The account, which is held in the Sikh tradition and is not documented in any contemporary source, is that after the fighting at Chamkaur a woman named Bibi Sharan Kaur came to the field at night to cremate the Sikh dead, including Sahibzada Ajit Singh Ji and Sahibzada Jujhar Singh Ji, whose bodies had been left where they fell.
She was found by imperial soldiers and killed, and thrown on the pyre she had lit.
There is no early source for it. It appears in later devotional literature and is widely told.
It is included here with that caution stated, because it is part of what people in Punjab know about Chamkaur, and because the pattern of women who acted at the edges of these events and were not recorded is itself the point.
Mai Bhago Ji is documented. Mata Gujri Ji is documented. Almost every other woman in the eighteenth-century accounts is not, and the absence is not evidence that they were not there.
The account is that she went onto the field at Chamkaur after the battle to cremate the dead, including the elder Sahibzade, and was killed doing it.
She appears in some traditional accounts and not in others, and she is one of the several women in the Sikh record whose historicity is argued.
The argument is worth stating plainly rather than deciding. What is certain is that the cremations at Chamkaur happened and that somebody carried them out.