You left yourself wide upon for a dodgy remark there, but I won't bite. In theory she could just be out and unable to reply.... however experience has taught me the most negative outcome is usually the most likely.
Whether I personally feel negative or not has absolutely no baring on whether she (or anyone else) will reply to a message.... Unless I put something like 'you probably won't reply, but hi'.... which would be a bit sillly.
Ever have that one flatmate who plays his wordless music at ridiculously loud volumes and every song sounds exactly the same? Yeah, that.
But having a negative mindset puts doubts in your mind all the time. Thinking like this will also carry to your emotions and how you talk to her.
Um your post? You thought she was ignoring because she didn't reply. That is negative, you need to chill out and not think bad about little things.