This is an old thread, but I have some suggestions! I loved that stuff myself, so I read a LOT of scary books.
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Books:
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Jane-Emily, Patricia Clapp
Down a Dark Hallway, Lois Duncan (this is not one of her teen slasher books, which I don't recomend for an 8-year-old)
The House with a Clock in Its Walls, John Bellairs
The Headless Cupid, Zilpha Keatley Snyder
The Halloween Tree, Ray Bradbury
The Witch Family, Eleanor Estes
Ruth Chew wrote lots of books about kids encountering witches that are great for kids your daughter's age
Robert San Souci's various collections of scary stories -- the Dare to Be Scared Series, and the Short and Shivery series. Very well-done stories from world folklore and urban legends. These REALLY scared my daughter, though! Although they seem quite mild to me.
Witch's Sister, Phyllis Reynolds Naylor
The My Sister the Vampire series is pretty dumb, but if she likes vampires enough she might enjoy it and it's age-appropriate.
The Wicked Wicked Ladies in the Haunted House, Mary Chase
The House on Hackman's Hill, Joan Lowery Nixon
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For everyone who remembers Wait Till Helen comes fondly, Mary Downing Hahn wrote a ton of other ghost stories!
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Movies:
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Depending how susceptible she is to getting freaked out, the Universal horror movies are great fun! Especially Frankenstein (but a little girl is accidentally killed by the monster, although she doesn't die onscreen) and Bride of Frankenstein. The Lugosi Dracula hasn't aged well, but it's fun to watch and there is no onscreening biting or vampire-staking at all.
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The Hammer horror films (Christopher Lee and Peter Cushing star in most) are also tremendous fun, but more violent and also contain heaving (but covered) bosoms.
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One of my favorite movies as a kid was the horror-comedy The Raven, with Vincent Price, Boris Karloff, and Peter Lorre -- and a teenage Jack Nicholson! Not scary at all, but full of fun gothic trappings and corny humor.
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And of cousre there's Ghost Busters, although it has only a few moments that are actually spooky.