Change the narrative style by using direct speeches.

"Whose picture is it?" I asked. "A little girl's of course," said Grandmother. "Can't you tell?" "Yes, but did you know the girl?" "Yes, I knew her," said Granny, "But she was a very wicked girl and I shouldn't tell you about her." 

I asked Grandmother whose picture it was. Grandmother replied emphatically that it was a little girl’s picturE- Then she asked me if I couldn’t tell that. I answered that I could tell but I wanted to know whether she had known the girl. Next, Granny answered me that she had known her. But she added that she (Girl) had been a very wicked girl and she shouldn’t have told me about her (Girl) .