That is a famous misquote from the Satmar Rav. What he said was go to any yid who went through the Holocaust and is still Shomer Torah Umitzvos. The specific line was any yid who rolls up his sleeve to put on tefillin and you see the numbers.
Although your grandmother probably does not wear tefillin, if she is a survivor and is a shomeres Torah Umitzvos, she would surely meet the Satmar Rav’s criterea.