High school crush accepts fb friend request I sent her over 2 years ago, haven't talked or seen each other in 8+ years. What does it mean?

Anonymous
So I had a crush on this girl about 11 years ago in high school and I was too shy to tell her and nothing ever happened, something that I still regret to this day. She was a great girl and someone that I cared for, but there were some things that I did back then that made her upset and I really wanted to fix it, unfortunately I never got the chance to. Over the years I've tried reaching out to her several times and she ignored everything. A couple of years ago, I decided to try one last shot and sent her a fb friend request and a pm, to which neither were responded to. After this was when I officially threw in the towel of ever trying to contact her again and moved on with my life. Well very recently she randomly accepted my friend request that I sent all those years ago and I was and still am in absolute shock.

I honestly don't know what to think of it, I'm planning on messaging her soon, but if anyone has experienced or done this before what could possibly be her reasoning for it?
High school crush accepts fb friend request I sent her over 2 years ago, haven't talked or seen each other in 8+ years. What does it mean?
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