Why did she carry my letters in her bag?

I sent to my friend who lives overseas a letter for her birthday and for Christmas.

She told me recently that she loves them and have been carry them for months in her bag because how pretty they were and they made her cry.

I know maybe friends doesn't send letters to each other nowadays, but it really suprised me how much she loves the letters.

Why did she carry my letters in her bag?
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