Bellatrix, quickly turning her attention to Molly, cackled with mocking laughter, only to see Molly attack her with fierceness and precision having cleared the three young witches out of the way. This provided an opening for Molly to strike Bellatrix with a curse that hit her straight in the heart, killing her.
I've always suspected Molly's lethal spell was a particularly well-placed and powerful stunner that stops Bellatrix's heart, which is consistent with the description of her death: Molly's curse soared beneath Bellatrix's outstretched arm and hit her squarely in the chest, directly over her heart.
Molly used Petrificus Totalus, the body binder spell, hence the fact Bellatrix was frozen, then she used a strong exploding spell, probably Reducto or Diffindo, whch destroyed Bellatrix.
Originally Answered: In the Goblet of Fire book, the Avada Kedavra is described as unblockable. However, in the Deathly Hallows movie, Hermione blocks an Avada Kedavra curse aimed at her.
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