Liz in September (2014) online

Every year, Liz, a hardcore party girl and womanizer, celebrates her birthday with her friends at a Caribbean beach retreat. This year is different. She is sick but hates pity, so she hides her terminal illness. When a young woman outsider arrives, Liz friends dare her to seduce her. But the ingenue is deeply wounded by the recent death of her young son, and nothing turns out as expected.