Why won't she accept my friend request?

I know her well and in person she always says high to me but I sent her a friend request and and message and no response at all, she's clearly updating her Facebook account..

only thing I can think of was she's mad I turned her down years ago.. Or I came on too strong in my message.. but all I was saying was asking how she was and maybe if you wanted to meet up..

But as far as me thinking she's really changed IMHO.
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I ran into her today at town hall, she talked to me like nothing happened someone was already in front of me when I walked in. my first thought was I was just going to ignore her but I walked up to the desk anyways as soon as she saw me she blew off the other lady and said HI all excitedly and started talking to me which made the lady before me a little puzzled/annoyed because she blew her off, after she left we had a little small talk finding how everything was. I did not bring up anything else
Why won't she accept my friend request?
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