I wonder whether she knew that it was not only Becky who wrote the letters, but that Mrs. Rawdon actually took and sent home the trophies which she bought for a few francs, from one of the innumerable pedlars who immediately began to deal in relics of the war. 
Becky not only wrote the letters, but also bought the trophies for a few francs from the pedlars who began to deal in relics of the war. 