Hello,
I am afraid that it will really be a needle in the haystack.
Ancestry shows 8 Hedwig Meyers born in 1880 just in Berlin. - If you find any gravestones, it can also be any Hedwig that has moved to Berlin or a married name..
If she lived until 92 years, that would be a death year of about 1972 - you will not find any registry records online due to data protection laws, and even if you knew where to search, you will not get access if you are not a direct relative.
https://www.deutsche-digitale-bibliothek.de/newspaper does only show results until 1945. I do not know if there are any other newpapers online for Berlin.
You could check the Berlin Adress books:
https://digital.zlb.de/viewer/berliner-adress-telefon-branchenbuecher/
Do you know if she was married? Or her profession?
And there is another possibility: She was orphaned with less than 3 years. Was she adopted? Did she get a new name?
Bst rgds Bettina
Was she married? Do you know her profession?