Just describing the situation in which Linda (Rose Byrne) finds herself in Mary Bronstein’s descent-into-hell motherhood drama If I Had Legs I’d Kick You is enough to provoke the state of heightened anxiety that the movie seeks to create in its audience. While her unhelpful husband (Christian Slater, mainly heard as a voice on the phone) is away on a long work trip, Linda finds herself single-parenting their chronically ill daughter (Delaney Quinn). Exactly what ails this elementary-school-age child is not clear. Indeed, the character is never named and remains an almost wholly offscreen presence, appearing only in oblique glimpses: a grimy hand, a sock-clad pair of feet. But whatever the little girl’s illness may be, it’s serious enough that Linda has to hook her up to a feeding tube ev

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