Although the source says that she was born in 1834, we wonder if this could be a mistake because the name is so similar, and if she was born in 1834, she would have been about 100 years old by the time she was in the ghetto. Also, if she was born in 1934, she would be just about the right age to be in School #6. I found her information by using the search engine provided and clicking the box for "sounds like" because nothing had previously showed up. We are not sure if the information is accurate, but her address given is near the school, so it seems a very potential match for Rela.
If Rela's birthdate perhaps is wrong in the original files, then her father seems to be Eliasz Rachwalski because he was born in 1900, so he would have been 34 when he had her. Also, they had the same ghetto addresses Alexhof 35 149 and Legionow 63. His occupation is listed as "Buchalter," but there is no additional information on his life in the ghetto or what happened to him.
Also, I believe we have found her mother because Juta Rachwalski was born in 1908, and she has the same first address as both Eliasz and Rela- Alexhof 35 149, but she does not have a second address listed for her. This information makes me wonder if something happened to her before her family was moved.
However, there is another member of the Rachwalski family who lived at both the Alexhof 35 149 and Legionow 63 addresses. Her name was Sura Gitla Rachwalski, but we are not sure how she might fit into the family.