This could be her: Hania Gross, born in Oswiecim on December 11th, 1934; https://yvng.yadvashem.org/nameDetails.html?language=en&itemId=6884160&ind=1 - according to this source she was liberated on January 27th, 1945, and emigrated to Sweden after the war
This could be her as well, according to this source her married name later was Rosenberg and her dob was December 12th, 1934: https://yvng.yadvashem.org/nameDetails.html?language=en&itemId=11429399&ind=1 - according to this source she was saved through a catholic Polish family: „In 1941, seven-year-old Hania Gross and her mother were imprisoned in the Sosnowiec ghetto. One day, Magdalena Matlak, who had in the past worked in their household, appeared in their home to tell the surprised mother that her brother Józef had agreed to provide refuge for the child in his home. Risking her life, Magdalena smuggled Hania out of the ghetto, and somehow managed to bring her to the home of Józef and Józefa Matlak, who lived with their children in the village of Przeciszow, near the city of Oswiecim. Hania was received warmly by the Matlak family, all of whom treated her well and provided for her every need. However, even after Hania was given an identity card belonging to a young cousin that had died, the neighbors continued to suspect the child’s identity. Despite the danger posed to their lives, the Matlaks continued to care for Hania as if she were their own, and Ludwika, their eldest daughter, spared no time and effort in cheering the child up and keeping her occupied. Hania Gross remained in the home of the Matlak family until the Red Army liberated the area in January 1945. Her mother survived, and after much suffering and hardship, she was transferred to Sweden. After the war ended, Hania joined her there. Both mother and daughter never forgot the efforts of the Matlak family to save them, which were motivated by altruism, and for which they neither asked for nor received any payment.
Hania Gross and her mother kept in touch with the Matlak family for many years after the war, sending them packages and money. On July 31, 1995, Yad Vashem recognized Józefa Matlak, her husband Józef Matlak, their daughter Ludwika Molenda (née Matlak) and Jozef’s sister Magdalena Matlak as Righteous Among the Nations.“ The Righteous Among the Nations Database
This page of testimony she submitted for her father Josef Gross: https://yvng.yadvashem.org/nameDetails.html?language=en&itemId=3987058&ind=1 - out of this source is to be learned that she still lived in Stockholm/Sweden in 2000
Hania Rosenberg om hur hon lyckades fly - Forum för levande historia (in Swedish)
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Story of Rescue - The Matlak Family | Polscy Sprawiedliwi
