She may have chosen to not show your posts on her wall. I wouldn't take it personally. Perhaps she just wants her feed to be filled with specific things.

My facebook feed is mostly music. A few of my friends post a lot about various things and it doesn't do me much good to see those updates so often so I have their statuses updates reduced via the feed settings. It doesn't mean I don't like them, and I'm not being passive aggressive. I'm just choosing what I want to read.