Dear Laurent,
Not exactly an answer to your question, but according to Mikhail Bykov, a leading authority on VVS fighter claims, Litvak made just one claim on 22 March 1943 - for a Ju 88 destroyed in Chaltyr - Sinyavka area. And she was no ace, her total was 4 personal + 3 shared victories (you can see a list of her claims on:
http://www.sukhoi.ru/forum/archive/i...p/t-42784.html)
Hope this helps,
Ota