We found 3 Reddit comments about NieR:Automata: Short Story Long. Here are the top ones, ranked by their Reddit score.
She has her backstory outlined in this book.
NieR:Automata: Short Story Long:
Though I do agree it would be cool to have a game dedicated to her.
Long story short: https://www.amazon.com/NieR-Automata-Long-Story-Short/dp/197470162X/ref=nodl_
Short story long: https://www.amazon.com/NieR-Automata-Short-Story-Long/dp/1974701840/ref=pd_aw_fbt_14_img_2/145-1617464-5409617?_encoding=UTF8&amp;pd_rd_i=1974701840&amp;pd_rd_r=8672d1bd-93fb-4917-bab6-970eca876e01&amp;pd_rd_w=HSDgz&amp;pd_rd_wg=2JiSe&amp;pf_rd_p=3ecc74bd-d08f-44bd-96f3-d0c2b89f563a&amp;pf_rd_r=KA44ZXTG4XR8T9SXJ28C&amp;psc=1&amp;refRID=KA44ZXTG4XR8T9SXJ28C
Both are kinda like the book that came out for Nier Gestalt and Replicant (I WANT to say Grimoir Nier but I might be remembering wrong) where they both include series of short stories in the universe.
Here's the ones I've either bought or want. They're all official:
Grimoire Nier (Japanese only). There's fan translations on the web of this: https://www.amazon.com/GRIMOIRE-Project-Gestalt-Replicant-Japanese/dp/4048686712/
Drakengard 3 art book and guide (Japanese only). https://www.amazon.com/dp/4048660861/
Nier Automata world guide volume 1 (English). I suppose there might be a volume 2 coming in the future: https://www.amazon.com/NieR-Automata-World-Guide-1/dp/150671031X/
And for the poorly-translated novels. Get only if you're not irritated by bad sentence structure, typos, and translation errors.