Does this friend not like me or something?

[Alanna]

I know that it's a really stupid way to judge if a friend doesn't like you or not but a friend that I talk to everyday in the morning unfollwed me on instagram. She acts fine with me in person though and we were all cool & stuff. Not sure what the reasoning is. And there's this thing where last year on Facebook she was no longer friends with me on there. I asked her about it and she said that she didn't know & other stuff.

Can someone honestly judge on if someone's not a real friend through social network activity?