Heartbreaking

"Her performance is highly physical; as a young Piaf she hunches over and shuffles when she walks, huge blue eyes darting frantically. Once Piaf becomes more successful, Cotillard plays her with an uplifted chin and an acquired hauteur to her movements. Finally, she plays the dying Piaf beautifully, retaining a spark in her eye even while she is covered in (surprisingly convincing) ageing [sic] makeup, shuffling once again due to illness." More...

PS. In this review the writer states that Mômone was Edith's half-sister. I thought they were best friends. Did I miss something?