I recommend The Babadook on a regular basis, especially as Halloween approaches, as I find it a superior horror film. I first saw it the year after it came out, and I'll mostly cut-and-paste what I said about it at the time:
The Babadook is an Australian horror film, the first feature from director/writer Jennifer Kent (an ex-actor). ... You could watch it as a standard horror film about a monster that comes from a book, and it definitely works on that level. But it is also ripe for detailed analysis, particularly from a feminist angle. ... The main character isn’t the titular monster, nor is it the frightened and disturbed young boy who initially seems to be its target. No, this is a movie about a mother’s grief, and [Essie] Davis plays the entire spectrum from holding-it-together to flat-out-losing-it in a moving and believable way. Kent’s eye is remarkable for a first-time director (with excellent work from Polish cinematographer Radek Ladczuk and book designer Alex Juhasz). She also worked hard to draw a strong performance from young newcomer Noah Wiseman, while also doing her best to avoid exploiting the child during emotionally intense scenes. The Babadook is better than a simple plot description might suggest, and I recommend it to most people (as the IMDB notes, it includes “Definite trigger warnings for anyone who had a violent or abusive relationship with parents”, so I can’t recommend it to everyone).
I was reminded of this movie a few months ago when I saw Hereditary. Both films are about grief, with strong performances by the lead actress. I prefer The Babadook, but your mileage may vary.