If a girl sends you her picture, does that mean she likes you?

Let's say I gave this girl a Christmas card, just for X-Mas' sake. She sends me a picture of her. She's been hinting to me that she likes me and such, but does that mean she likes me? I didn't even ask for her picture or anything. Couldn't she just gave me a card without her picture? Or maybe I'm making too much of this.
If a girl sends you her picture, does that mean she likes you?
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