After a bad date she lost interest and After texting her a week later she was cold and extremely slow to reply which was the exact opposite before. I took it as a sign she was not interested and I decided to next.

A few weeks later I saw her instagram story at a beach and I sent her a text reply on it saying: "Gone for a dive? :P" .

I immediately regret it, I should just kept radio silence. So if she replies I should see it and ignore? She is in my Uni so I might see her sometime although I havent seen her for a few weeks.