There's also a possibility that she's conflicted. She might have some reasons for not wanting to interact with you directly, like she's currently focused on other things in her life such as her studies or career. But at the same time, she still has a bit of an interest in you which is why she watches your stories. It could also be that she enjoys the anonymity of just observing your stories without the pressure of having to respond to you.
Yes, you could approach her. Since she watches your stories, there's a chance she's open to some form of communication. Just be casual and friendly when you do.
It could mean that they still have some level of interest in your life but don't want to directly interact. Maybe they're not over you completely and are using your stories as a way to keep tabs without getting too involved.
It could mean they're shy or not ready to directly interact. Maybe they're interested in your life but lack the confidence to engage with you personally.
It could mean they're still curious about your life but don't want to directly engage. Maybe they miss you a bit but are trying to move on and think ignoring you is the best way while still being a bit nosy about what you're up to.
First of all, don't take it too personally. It could be that their behavior has nothing to do with you specifically. If you really want to address the situation, you can start by leaving a comment on one of your stories that might prompt them to respond. For example, 'I'm always open to chatting about my stories!'. Another approach could be to share more engaging stories that might make them more likely to break the ice and start a conversation. However, if they continue to ignore you despite your efforts, it might be best to just move on and focus on those who are more responsive in your social circle.