who is madame schachter?

Madame Schächter - A Jewish woman from Sighet who is deported in the same cattle car as Eliezer. Madame Schächter is taken for a madwoman when, every night, she screams that she sees furnaces in the distance. She proves to be a prophetess, however, as the trains soon arrive at the crematoria of Auschwitz.

Here is something from a superrior site to Sparknotes,

Madame Schaechter

Madame Schaechter is in the same train car as Eliezer during the initial deportation to Auschwitz. She had been separated from her husband and two older sons, and she is accompanied by another younger son. She loses her mind during the journey and screams hysterically and repeatedly about a flaming furnace that she apparently sees in the distance. She terrifies the other occupants of the train, and she is repeatedly beaten by young men trying to silence her.

Everyone may say that she was a crazy person but she was not she was a nice Jewish person