She shall be burnt with fire - Probably not burnt alive, but strangled first, and then burnt afterward. Though it is barely possible that some kind of branding may be intended.
burnt with fire - See the Leviticus 20:14 note.
9. The daughter of any priest. If a young woman of the people sin, her punishment was to be according to the gravity of the offense. But if the daughter of a priest was immoral, there was but one lawâdeath by fire.