Lemme guess. The girl who collapses is teen Anastasia, and Ivy somehow is accidentally responsible for her near-death due to clumsiness and/or stupidity and/or not following her mother’s instructions. As she collapses, Belfry uses some potion or flower she kept from when she escaped the tower to save her last breath, or has some know-how that she learned from being around Gothel. Since then, Belfry has always hated Ivy, blaming her for her sister’s near-death, and always believing that Ivy/Drizella is through and through incapable.
Excecpt that in “The Garden of Forking Paths” Lady Tremaine blames me Ella for Anastasia’s ‘death’ and that’s why she was locked in the attic and made to be their slave. And Ella also believes she’s had some responsibility in it because she allowed herself to be kept in that situation by her step-Mother. I think Drizella is actually responsible for Anastasia’s ‘death’ and has someone made it look like Ella was responsible.