There is a tombstone match for a Hermina Schreiber born in May 20, 1894:
https://www.jewishgen.org/databases/cemetery/jowbr.php?rec=J_ON_010...
Is this the same Hermina?
If so, her date of death of Dec 22, 1968 can be added.
Also, her father's Hebrew name would have been Elkanah, which might open new avenues to find records about him.
