Why isn't Riwke Mendel's Yahrzeit Exact?

We do not know the exact date of death of Riwke Mendel. According to Jewish tradition, if the exact date of death is not known, the yahrzeit of a person can be observed on any day, as long as it is that same day every year. Since that is the case, we observe the yahrzeit of Riwke Mendel on 21 Av. If you know the exact date of death of Riwke Mendel, contact us via the contact page. Be sure to include the url: https://eachofushasaname.org/person/4091/Riwke_Mendel.html