Girl I've known for a while send bikini snap to me. Flirting or friendly?

Recently got back into contact with a girl I've known since my childhood. We used to hang out and remember one time she gave me a hug and never forgotten about. Seems like things are friendly but then she sends a bikini pic of herself while in vacation.

Flirting
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Girl I've known for a while send bikini snap to me. Flirting or friendly?
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