Gender: girl
School:
School #4B
I searched for K* Gepner and Krajndla was the only female who came up whose birth year made her the right age to attend School #4B.
I searched for everyone with the last name Gepner that lived at one or both of the same places as Krajndla. I found her likely father (Efrojm/Ojzer, b. 1891), mother (Sura/Mindel, b. 1900), and possible siblings Abram (b. 1921), Chaja (b. 1923), Icek/Icchok (b. 1925), and Szymon (b. 1930.)
Both Krajndla and Sura Mindla/Mindel Sura were deported on September 10, 1942, on which date (according to Secondary Sources) there was a deportation to Chelmno. This is where they likely ended up.
Icek/Icchok and Szymon are both listed as moving to a new address-Rubens 9--on January 7, 1943. No other information is listed about their fate.
Efrojm/Ojzer died on July 1, 1941 of currently unknown causes.
I was able to put together pieces of Abram's fate from all the databases where his name showed up. He changed addresses and moved to Rembrand on August 13, 1941. I found that he was born in Litzmannstadt due to information found on a Mathausen inmate list. He appears to have survived Mathausen and the war, as he entered Ebensee Displaced Persons camp on March 9, 1945 and his name was also released on a Sh'arit Ha-pl'atah (survivors) list, which listed his last known location as Salzburg.
No information is known about Chaja's fate.