I am not positive, but Towa seems like it would be a good candidate to be a nickname for Tauba. They sound quite similar, so it could also be a translation difference. Tauba's birthday would seem to indicate that she is the Towa I am looking for. Googling "nicknames for Tauba" gave me nothing, but I do believe this is the student I am looking for.
Also, I was not able to find anything else about her, but when I Googled her name, I did find Tauba Ismach listed in a page titled "Jewish Lodz Cemetary." This doesn't tell us anything about how or when she died, but it would seem to indicate that she died in the ghetto at some point.
I found Tauba's parents and siblings because they all have the same address, and the birthdays of the others would seem to indicate that they were either Tauba's parents or her siblings.
Unfortunately, I was unable to locate Tauba or any of her family members in any of the next stages.