Why didn't she respond to my fb message?

[Anna]

- She may be too shy to respond back because she likes you back too and doesn't know what to say
- She doesn't like you or care to talk to you so she ignores you
- She may have seen the message, didn't have enough time at that moment to respond but forgot later on
- Someone else may have gone on her fb.. Ex maybe she was with her friends, then while talking with them she logged on to fb and left it on while her friend got on and happened to click on the message so it says read now but maybe it wasn't read by her. The friend either though it was insignificant enough to mention, or forgot to mention, or did mention but the girl ignored it anyway.
- Her mom and dad may snoop through her fb to make sure she isn't doing anything wrong and clicked on your message but didn't tell their daughter so she wouldn't get angry

Those are all the explanations I can think of.