There are 2 Bluma Zajac's listed in the Lodz ghetto listing. The other option besides the Bluma that I believe to be the student was a listed for a Bluma Zajac who's age was 1 years old in 1940. That is how I came to conclude that the Bluma Zajac we were looking for was for the date of birth 09/09/1928.
Bluma had different addresses listed on JewishGen's Lodz Ghetto list.
First address listed was Franz 38. Second address was Kuhle 6 10, followed by a change of address on 03/10/1942 to Cranach 34.
Bluma had the same address listings as Chana Zajac (b 12/15/1907) on JewishGen Lodz Ghetto list. Due to her exact address changes, and her age, I believe her to be a good fit to be Bluma's mother. Also listed on the list was a Hela Zajac (b 1918 or 1919). She had the same Franz address and flat as Bluma, but was sent to Chelmno on Transport 10 (as listed on JewishGen list). I believe this may have been Bluma's older sister, who was transported to Chelmno before Bluma and her mother were transferred to the 2nd address.