Hello,
I was wonder if you have taken contact with the synagogue in Kishinev and asked some rabby there. They use to know where to advice you. The reason i am thinking that is that each boy who born make their Britt Milah wich most have been noted somewhere?
I am looking too after more information about my grand mother´s mother who also born in 1890 in Kishinev. I am seerking everywhere and use all the link, adress and will this next summer there to a tripp back to my ancestry to find out more there.
Obs! you remember about the progrom in 1903 in Kishinev so many of them had to move away.
I will keep in touch if i find out more information to help you too.
Let us hope for the best.