Her daughter Laurie Wenk-Pascal announced the news toThe New York Times.
The Pascals later would collaborate with Francines brother Michael Stewart on the book for the 1969 Broadway musicalGeorge M!
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But her signature success came in the 80s with the Sweet Valley High book series.
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A feature film had long been proposed but was never made.
While the original book series ended in 2003, a sequel series was released in 2011.
Along with Wenk-Pascal, she is survived by daughter Susan Johansson, six grandchildren and five great-grandchildren.
A third daughter, Jamie Stewart, died in 2008.
