Katharina/Katalin Oestreicher

Death:

https://www.familysearch.org/ark:/61903/1:1:Q2S1-F6YH

+
https://www.familysearch.org/ark:/61903/3:1:9398-9R92-92?cc=1787825...
Name Katharina Ostereicher
Sex Female
Age 82
Death Date 30 Oct 1871
Death Place Óbuda, Pest-Pilis-Solt-Kis-Kun, Hungary
Birth Year (Estimated) 1789
Event Type Death
Page 41
Note born in Totis [Tata]; Rabbi's widow
Registration Place Obuda

Mayer Ostereicher was indeed the rabbi, and the year suits, so it's her (although the maiden name is not mentioned in the death record).

Now when I know that she was born in Tata, I assume she is the sister of Abraham Kempner from threre, who is very close to her age.

death of daughter https://www.familysearch.org/ark:/61903/3:1:S3HY-69DQ-ZZX?i=54

marriage of daughter n :LDS, 642,817, vol. 20
90-8