Vanity was stronger than love at sixteen and there was no room in her hot heart now for anything but hate.

The line anatomizes adolescent passion as something easily mistaken for love but driven by pride and self-regard. “Vanity” suggests a need to be admired, chosen, or to win—an ego-centered motive that can override genuine attachment. The pivot from “love” to “hate” implies how quickly youthful intensity can harden when desire is thwarted or humiliation is felt: the same “hot heart” that once burned with longing now burns with resentment. The sentence also hints at a moral psychology common in Mitchell’s characterization: romantic ideals are entangled with social status, competition, and wounded pride, and when those are threatened, emotion becomes absolutist—leaving “no room” for nuance, forgiveness, or self-knowledge.