So Sveta went to visit her grandparents in Gadukino, and offered to help her grandmother, who asked her to pick berries in the wood. Sveta said she would, but since I wanted her to visit Mira first, I said she'd do it later. I talked to Mira, then went to the woods and picked the berries ( and mushrooms as well), then returned to the village. However, it was after 8PM, and Sveta's grandparents were already asleep in bed, so she couldn't hand over the berries. That had to wait till the next time she visited, which was several days later.
But when Sveta returned, her grandmother scolded her for not picking the berries like she'd promised, even though she had them to give to her. I know this, because about 10 minutes after this, I was able to sell them in the village. So why can't you finish the task with her grandmother?