On lines 302-4, Earl Schulze argues that the rejection of the mother "symbolizes the desertion theme that defines the dark aspect of deliverance by the Moon lady. Although the questor dreams of himself as victim, he is in the ambivalence of the Moon's realm" (209).
Schulze, Earl. "The Dantean Quest of Epipsychidion." Studies in Romanticism. 21.2 (2002): 191-216.