Terry,
The translation is as follows below.
7 Tevet 5690 corresponds to 7 Jan. 1930.
Yours truly,
Keith (Osher)
First line: po nikbar (abbr.) – here lies
Second line: Imanu ha’yikara – our beloved mother
Third line: Sima Perlsweig
Fourth line: niftara (abbr.) 7 Tevet 5690 – who died on the 7th of Tevet 5690
Fifth line: tehi nishmata tsrurah b’tsror ha’chaim (abbr.) – may her soul be bound up in the bond of eternal life