You're Not You (2014) on Netflix

Kate is a classical pianist just diagnosed with ALS. Bec is a brash college student and would-be rock singer who can barely keep her wildly chaotic affairs, romantic and otherwise, together. Yet, when Bec takes a job assisting Kate, just as Kate's marriage to Evan hits the skids, both women come to rely on what becomes an unconventional, sometimes confrontational and fiercely honest bond. As meticulous, willful Kate begins to rub off on whirlwind, spontaneous Bec - and vice versa - both women find themselves facing down regrets, exploring new territory and expanding their ideas of who they want to be.