My mother was born in 1945 in lwow Rosja.
How I can get her birth certificate?
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Assuming the place is Lwów (Polish name) or Lviv (current transliteration from Cyrillic) - it's a city currently in Ukraine, in 1939 it was annexed by the USSR, previously part of Poland. To get her birth certificate, you need to go to ZAGS (civil registry) archive in Lviv. I don't think they do it remotely, but things change, yo can check that. If not, you probably can find and hire a local representative for that, it shouldn't be too expensive.