Should I take this as she disrespected me or not?

I am friends(not in the true sense) with a Favorite of mine on facebook. I don't really chat with her much other than every now and then sending her a pvt message to say I am headed to the club or sometimes to just say how you doing. Well Yesterday I sent her a pvt message just wishing her a Happy Newyear and that I will probably be at the club in a few weeks. She did not respond, I know she saw the message because it was marked as "seen" in my inbox. She had wrote on her wall that she had been apartment hunting for most of the day, but she still managed to get on facebook later that day and write on her wall. So I feel that while she was busy during the day she could have still replied later on when she got back home that night.

So should I take this as being disrespected? She has replied in the past to "how are things going"t type of messages but not this time. Furthermore, I should point out that she doesn't send me messages. I have been the one doing the messaging. So should I not get anymore dances from her?, Should I ask her at the club why she didn't respond? or should I just cease all messaging with her on facebook even in telling her I am making a trip to her club?