The Mishna lists the neglect of Niddah, Challah and Ner Shabbos which can be seriously consequential during childbirth. How is it that Ner Shabbos which is only a Mitzvah derabanan, is equated in severity with Niddah and Challah which are issurim min hatorah?
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By Lighting shabbos candles on time you are keeping shabbos which is a dorayasa
CHavah extinguished the light of the world (caused death) by eating from the ezt hadas, now by lighting shabbos candles the woman is rectifying her sin
Transgressing a Dirabanan is also enough to deserve death. These three mitzvos are chosen becaue they are Mitzvos that were given specificaly for her.