The ship list you found is from 1909, not 1940. It says that Sore is going to her brother Simche Zajaczyj, who lived at 4022 Germantown Avenue in Philadelphia. Since that time, the Jewish community of Philadelphia has moved away from that neighborhood, to the Northeastern part of the city, to the Western suburbs (where Havertown is) and also to the Northern suburbs, and parts of Southern New Jersey (mainly near Cherry Hill). The descendants of Sarah and her brother Simche could be all over the greater Philadelphia region, and also live in other parts of the US.
I did use SteveMorse.org to check out who was living at 4022 Germantown Avenue in the 1910 US census, and found a Simon Zayon living there, with his wife Mary and two children. The sister Sore wasn’t living with them. (The name Zayon was mis-indexed by Ancestry as ‘Zagon’).
The listings that you found for the Saontz family of Havertown – the Memorial Plaque listings are not complete, and do not include all synagogues in the Philadelphia region.
I suggest you research more about Simon Zayon and his family in Philadelphia, who say they came to the US in 1906.--
Lak/Lok/Liak/Lock and Kalon/Kolon in Zagare/Joniskis/Gruzdziai, Lithuania
Lak/Lok/Liak/Lock in Plunge/Telsiai in Lithuania
Trisinsky/Trushinsky/Sturisky and Leybman in Dotnuva, Lithuania
Olitsky in Alytus, Suwalki, Poland/Lithuania
Gutman/Goodman in Czestochowa, Poland
Lavine/Lev/Lew in Trenton, New Jersey and Lida/Vilna gub., Belarus