It's worth noting the theme of emotional labor, particularly for Black women and girls. Starr is expected to manage everyone's feelings—her white friends' discomfort, her family's fear, the media's hunger. Her mother, Lisa, does the same. The plot is, in part, about Starr setting boundaries and refusing that labor.
Her breakdowns, her anger, her moments of vulnerability are rebellions against the 'strong Black woman' stereotype. The theme is that this strength is often a survival tactic, not a superpower, and it's okay to not be okay. True strength is sometimes allowing yourself to fall apart and trusting others to hold you.