Movie about a woman that invades a house and then adopts a couple with a baby

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Hi. Well I’ve been looking for this movie for about 8 years. It might be British or Irish film.
It’s about a woman that is living in this country house somewhere in UK or Irland, and then she starts to pretend to be the owner of the house. Later she let a couple with a baby to go to live with her and they start to pretend to be a family. Then the actual owners send a mail or something saying they will be back to the house and this woman poison everyone even the baby, before they get caught in the lie.

This is how i vaguely remember, it could be a homeless woman intruder or maybe a housekeeper. Thank you in advance!

Katsgy Asked question May 7, 2022