The Maid (2020)

The last hour and so, Joy goes on a revenge spree for her older sister Ploy's death and seeking out those who buried her alive and taking Ploy's baby and raised her as their own daughter.

Alcohol: Wine, whisky. Drug: poison.

Lady Nid sees a shadowy figure in her bedroom, along the wall are pictures of her new friend. In a different scene, a shadowy figure of a woman in the doorway of the bathroom and also in Lady Nid's bedroom. We find put later that shadowy figure of a woman was Ploy the older sister of Joy.