On 10 May, a court in Omdurman sentenced Noura Hussein, 19 years, to death after her husband's family refused to accept a financial compensation requesting the capital punishment.
Hoping for a miracle to stop her daughter being hanged, Hussein mother, Zainab Ahmed, told the BBC she was happy that her life had been spared.
Global celebrities had backed an online campaign, #JusticeforNoura, to demand Hussein's release.
She claimed her father forced her to marry the man, who was also her cousin, and she was subsequently sentenced to death by hanging in May by an Islamic court for the murder.
Hussein says after repeatedly refusing to have sex after the wedding, three of her relatives pinned her down as her husband raped her.
"The next morning he tried to rape her again but she managed to escape to the kitchen where she grabbed a knife".
Her lawyers say they plan to appeal both the jail term and the payment.
Hussein has been held in a women's prison since May 2017.
The teenage housewife who killed her husband for rapping her has received reprieve as a Sudanese court commuted her death sentence.
"Thank you to over 400,000 of you who demanded JusticeForNoura & helped make this happen!" the UK-based group tweeted on Tuesday.
In Sudan, there is no law criminalising marital rape.
The young lady had been married off to her husband at 16 by her father. Her campaign was tagged "Justice For Noura".
"Noura has become a real icon of the struggle of the Sudanese woman against these laws", Amira Osman, the women's rights advocate with the No to Women's Oppression coalition, Sudan's top feminist organisation, told MEE last month.
"We commend the Sudan government for overturning the death sentence on #Noura", the Civil Society Forum on the African Charter on the Rights and Welfare of the Child, a coalition of child rights charities, said on Twitter.