What's the Name of That Book??? discussion

This topic is about
April's Witches
SOLVED: Children's/YA
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SOLVED. Children’s Occult Thriller, chapter book with illustrations. Girl goes to stay with her two aunts, both witches, and thwarts a black magic ritual. Read and published early to mid-1970s. [s]
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Somehow the girl unwittingly learns about a black magic ritual (not involving the aunts) about to take place and she investigates but is caught by the bad guys, who then try to use her in the ritual. One of the illustrations depicts the young girl lying down, covered with a quilt, with coins on her eyes (!!) Scary and dark little book, but with a sweet side…she and her aunts love each other very much, have fun together, etc. Read and published in the ‘70s.
Anybody know? TIA!