Stardust (2018)

Louise is an eclectic and eccentric spirit who makes sense of the universe through the belief that she is an alien - made up of stardust and here only for a limited time to serve a certain cause. She shares her devotion for aliens and the outer space with her grandchild Stella. As Louise ages and prepares for her passing, she chooses to use this shared love for space to explain to her grandchild what exactly is going to happen to her. To Stella, her Nanna isn't dying, but rather going on a long trip up into the stars.