Contrary to the movie script, Lyudmila was already married and had a son before war.
Lyudmila Mikhaylovna Pavlichenko was born on July 11, 1916, in Belaya Tserkov, Vasilkovskiy uezd, Kievskaya guberniya, Russian Empire [now Bila Tserkva, Kyyivska oblast, Ukraine]. She died on October 27, 1974, at the age of 58, in Moscow, RSFSR, USSR [now Russia]. The total of her confirmed kills during World War II was 309, including 36 enemy snipers.
When Eleanor Roosevelt met the representatives from China and USSR, the first Chinese soldier said his name is Qiu Shaoyun. Qiu Shaoyun is a real historical figure. However, he didn't join the army until 1949, and he is a soldier of the People's Liberation Army, which means it is impossible to see him as a representative of China to the US in 1942.