Why did she do one thing for one and did another thing for the same thing?

Sorry for the confusing question title.

I sent a girl I like, a private message of a photo, something I bought that I had told her I was planning on buying anyway. I sent a little note along with it too. She never replied, but, since it was on insta, i posted the exact same picture with a caption of course. She decided to "like" that post, but didn't comment.

However, today, i also sent her another picture of something good that happened to me on insta, and she decided to reply to it "that's awesome "insert name here"". But I posted it as a public pic too, and she didn't "like it". She would have seen it, because I posted it as a story too, and she always watches my stories.

So, why did she "like" the first photo in public only, but then reply to the 2nd photo in private only.

I realize I'm probably making a big deal out of it, but, it just confused me. I guess I'm just trying to see if there's a pattern here?

Why did she do one thing for one and did another thing for the same thing?
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