I read (somewhere) that in Britain at least (but not perhaps elsewhere in Europe) a woman convicted of witchcraft was usually hanged not burnt.
If she was also guilty of killing her husband, that was classed as "Petty Treason" and then she would be burned. Although in later times she would be strangled by a rope around her neck which would be pulled as the fire was lit. That failed in the execution of Margery Bedingfield.
Offences like "coining", making false money, was also Petty Treason so a female coiner might be burned to death.
Orginally a male coiner would be hanged, drawn and quartered, the usual male penalty for treason.
I read of one case in the later 18 thC, they had stopped the use of H, D & Q, so the man was just hanged. His female partner was burned at the stake. Seems very harsh, the judge must have had it in for women, perhaps he had a wicked stepmother (like myself).[IK