What does it mean if a girl likes then unlikes a picture on instagram?

[Tangent]

Today I posted a picture on instagram relating to something that she has in common with me, soccer. 4 hours after I posted the picture on instagram I got a notification that the girl I like liked my photo then when I went to look it said she didn't like it which means she unliked it right away. Does that show any signs or do girls think it is weird to be liking photos only like 4 hours old. Personally I don't think it is weird liking old photos until they are 1 day old but let me know.

Updates

+1 y

Also I wanted to make it clear that I have been talking to her for about a week and we do know each other pretty lightly but I have caught her staring at me and she has done the same to me.

[kara0074]

Maybe she is trying to get your attention... or maybe she also likes you and felt weird about liking your pic