After asking if she would send me a photo of her two best friends, my younger sister refused. Why do you think she did that? Was I wrong to ask?

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for context she showed me and my parents the same photo at a family reunion
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Should I say nothing or apologize to my sister for asking her for the photo?
After asking if she would send me a photo of her two best friends, my younger sister refused. Why do you think she did that? Was I wrong to ask?
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