Like Aditi, the mother of Adityas (including Indra), Danu is one of the wives of Kashyap Rishi who is the mother of Danavs. This Rigvedic Verse that describes the killing of the dragon Vritra by Indra says:
8 There as he lies like a bank-bursting river, the waters taking courage flow above him. The Dragon lies beneath the feet of torrents which Vṛtra with his greatness had encompassed.
9 Then humbled was the strength of Vṛtra's mother: Indra hath cast his deadly bolt against her. The mother was above, the son was under and like a cow beside her calf lay Danu.
10 Rolled in the midst of never-ceasing currents flowing without a rest for ever onward. The waters bear off Vṛtra's nameless body: the foe of Indra sank to during darkness.
Does this imply that Danu was killed or is she just lying by her dead son's side? Are there any scriptures that elaborate on this? If Danu was dead would that mean there were no more Danavs born after Vritra?