Sorry, I'm not familiar with this event, but it sounds interesting for sure. Women often score brilliantly in shooting competitions so I don't doubt that it could have happened.
Sounds like you're mixing up details on the alleged sniper duel in Stalingrad between a Major Konings of the Wehrmacht and Russian "super-sniper" Vasili Zaitsev. This was featured in the book "Enemy at the Gates" (and in fact that one little passage is what they built the entire movie "Enemy at the Gates" around) but other authors have said they don't think that actually happened, they can't find documentary evidence to support it.
The Red Army, however, did have a number of female snipers in WW II who performed spectacularly.
}:-)4
This was documented in the excellent book entitled, "Enemy at the Gates." It's many years old but should be available at your public library. The event takes place during the siege of Stalingrad.
There is a great movie out with the same name that stylizes the story but is great to watch, starring Ed Harris as the German sniper and Jude Law as the Russian.