There are several possibilities. One is that she's simply bored and your stories are a form of entertainment for her. Another is that she's being friendly and is just casually keeping up with what's going on in your life. But quite often, it can indicate that she has a romantic interest in you. She may be too shy to directly interact with you, so looking at your story is her way of staying connected without having to initiate a conversation. It could also be that she's comparing her life to yours in some way, either to feel better about her own situation or to get inspiration from yours.
Well, it might just be that she's curious. She could be curious about your daily activities, the things you do, or the people you hang out with. However, it could also be a sign that she has some level of interest in you on a more personal level. For example, if she looks at your story right away every time you post it, it's likely she's paying special attention to you. But it's also possible that she just enjoys the type of content you post, like if you post a lot of interesting travel stories or funny memes.