British film with evil child?

I can't remember the name of this movie. It's a British film from probably back in the '70s. A strange woman comes to the home of a family(they live in a farm) where she gives birth. After giving birth she disappears leaving the baby with them. As this girl grows up she starts killing off the couples... show more I can't remember the name of this movie.
It's a British film from probably back in the '70s.
A strange woman comes to the home of a family(they live in a farm) where she gives birth.
After giving birth she disappears leaving the baby with them. As this girl grows up she starts killing off the couples children.
Can you help me please?
At first I though this movie was called Godsend.
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