My friend of 15 years is married and sends me post workout pics posing, recently sent me a bikini pic, is she flirting?

We've been friends for 15 years and people have told me she has a thing for me. We've hooked up in junior high. I used to work with her husband. I notice she is communicating with me more often and has snapchatted a picture of her in a bikini to me and snaps pictures of her posing in workout clothes often. What does this mean?
My friend of 15 years is married and sends me post workout pics posing, recently sent me a bikini pic, is she flirting?
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