Model Hunger (2016) on Netflix

Plot summary

Ginny Reilly was a pin-up model and actress until the modeling industry, judging her body type, cast her aside when she was a young woman. She does not accept the rejection, and over the years she becomes a revenge-seeking, blood-thirsty, broken woman. Debbie Lombardo and Sal move in next door to her. Debbie notices strange things happening at Ginny's house, but Sal puts it down to her unstable mind and believes she is imagining them. Debbie is set on learning what secret life her neighbor leads, and her watching gets in the way of Ginny's activities at home, including her cannibalistic food addictions.