See No Evil/Blind Terror (1971)

In the countryside of England, Sarah returns to Manor Farm to live with her uncle George Rexton, her aunt Sandy Rexton and her cousin Betty Rexton after an accident with her horse where she was blind. Sarah knows the interior of the house by heart so she can independently move by herself. When her former boyfriend Steve Reding invites her to visit his horse farm, George and Sandy tell that they are going to visit a friend and Betty tells that she has a date so she will be alone for a couple of hours when she returns to the house. Steve still loves Sarah and they ride together in the fields. When Sarah returns, a maniac has killed her family and the gardener Barker but she cannot see them dead. On the next morning, Steve gives a horse to Sarah and she leaves the animal in the stable. When she returns to the manor, she finds that her family was murdered and Barker that is still alive shows her a silver bracelet on the floor with the name of the killer. He tells that she is in danger since the killer will return to the manor to retrieve the bracelet. Barker dies and the killer comes back to the house.

IMDb: https://www.imdb.com/title/tt0067727