Renias story was shot by the Nazis when she grew up in 1942. She was too painful to be read by her surviving sister and mother.
Now Renia's diary: The Life of a Young Girl in the Shadow of the Holocaust is finally to be published by her family. And it already draws comparisons to the diary of Anne Frank for his clarity and neat writing.
The girl lived in Przemysl, southeastern Poland, under Soviet occupation until the Nazis invaded the Soviet Union in 1941.
The almost 700-page diary begins in January 1939, when Renia was 15, reporting on her escape from bombing raids in her hometown, the disappearance of other Jewish families, and the founding of the Ghettos.
Renia and her sister Elizabeth (née Ariana) were separated from their mother, who was on German side during the war. Almost every entry in the journal ends with "God and Bulus will save me," using the girl's nickname for her mother.
Renia, an aspiring poet, also fills her diary with dozens of compositions and reports of her fall into love for the first time with a boy named Zygmunt Schwarzer.
The two exchanged their first kiss a few hours before the Nazis reached Przemysl.
Renia was assassinated in July 1942 at the age of 18 when the Nazis left her hiding place discovered in an attic. She left the diary with her friend who wrote the frightening, heartbreaking last lines in the diary: "Three shots! Three lives lost! All I can hear are shots, shots." he was deported to Auschwitz. He survived, moved to the US and in 1950 managed to return the diary to Renia's sister Elizabeth along with her mother Róża, both of whom lived in New York.
Elizabeth could not bring himself to read it, and decided to deposit it in a bank vault. Only in 2012 did her daughter Alexandra Bellak insist on translating the diary into English so that people from all over the world could read it.
"I was curious about my past, my heir, this special woman I was named for (middle name is Renata) and I do not speak Polish (thanks mom!) And she never read it because it was too painful "Alexandra told CNN in an interview conducted via Facebook Messenger.
When she read it for the first time, she was "broken heart," she said.
"I understood its depth and maturity as well as its good writing and poetry and with the rise of all isms – anti-Semitism, populism and nationalism – both I and my mother saw the need to bring this to life."  Alexandra said her mother, now 87, did not read the diary completely because it was too painful for her. "She just read the excerpts that were printed in the Smithsonian," she added.
She added that the first reaction from people who read it was overwhelming. "From young and old they praise the outstanding writing, the longing for a normal life, the longing for their mother," said Alexandra.
Here are some excerpts from the book:
August 15, 1939
I have not spoken to you for a while. The end of the school year is long gone, my summer holidays are almost over
and I have not spoken to you. I went to my aunt in the country, I went to Warsaw,
saw mom and now I'm back. But you do not know anything about it. You have lain here with my thoughts left alone
and you do not even know that we have a secret mobilization, you do not know
that the Russians have one Signed contract with the Germans. They do not know that people are accumulating supplies
that everyone is on guard and waiting for … war. 1945
June 7, 1942
Wherever I look, there is bloodshed. Such terrible pogroms. It is killed, murdered. God the Almighty, for the umpteenth time I humble myself before you, help us, save us! Lord God, let us live, I pray you, I want to live! I have learned so little about life. I do not wanna die. I am afraid of death. It's all so stupid, so petty, so unimportant, so small. Today I'm worried about being ugly. Tomorrow I could stop thinking forever.
Think tomorrow we could not
A cold steel knife
Will glide between us, you see
But today is still time for life
Tomorrow the sun could set
Bullets could crack and tear
And howling sidewalks
With blood, with dirty, stinking slag
Today you live
It is still time to survive
Let's mix our blood
 The song of the wild and furious flood
Delivered by living dead
Listen, every muscle trembles  My bdydy fiddles with your closeness
It's supposed to be a choking game, that's
Not enough eternity for all kisses
July 15, 1942
Remember this day; remember it well. They will tell generations to come. Since 8 o'clock we are locked up in the ghetto. I live here now. The world is separate from me and I am separated from the world.