* She has written under different names: She has written books under her own name, Anne Mazer, and also under the pen name "Anne Mazer Leibowitz."
* She has collaborated with others: She has co-authored books with other authors, including her husband, Harry Mazer.
To get a more accurate count, you would need to consult a comprehensive bibliography that includes all her works under both names and takes into account collaborations.
However, you can find information on her books and collaborations on websites like:
* Goodreads: https://www.goodreads.com/author/show/11888.Anne_Mazer
* Amazon: https://www.amazon.com/Anne-Mazer/e/B001H5H288
These sites often provide a more detailed overview of her work.