As far as I could determine, Nerin E. Gun has not written anything other than that biography of Eva Braun, and there is no other biography. Apparently she did keep a diary, which as far as I can tell is out of print; in 1997 Alison Gold, a historical novelist, used the diary as the basis for a historical novel about Braun, which IS in print (from Faber & Faber). It's listed on www.amazon.com
I wish I could be of more help, but that's all I've got here.
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