Please help…its driving me crazy 🙃

So 2019 I watch a trailer on watchmojo for upcoming 2020 horror film (I’ve  looked bk & its not there now) but can’t remember what it is…

Woman gives up a baby daughter at 17 then goes on to have a family later on in life & has a new daughter.  They all live in a 1 storey house with pool.  Doorbell rings and adopted daughter has tracked down the mother who apologies for her decisions when she was younger & invites her to get to know the family.  New daughter is getting bullied at school & adopted daughter punches bully in face.  Obsessive behaviour begins & family discover all is not what it seems with this girl….

I hope someone can help me find the film title xx