She might notice that you're no longer viewing her stories and feel a bit disappointed or curious about why. But if you two aren't that close, it may not matter much to her.
Perhaps there was something in her stories that made you uncomfortable. It could be her attitude in the stories, or the topics she was constantly talking about that you didn't like.
It depends. If you still have feelings for them, it might make you a bit uneasy. But in general, it's a normal part of the post - breakup process. They may be trying to distance themselves for their own emotional well - being. So, don't worry too much unless there are other signs that something is wrong.