Send her a friendly and non - pushy message like 'I noticed you've been watching my stories. I hope you're having a great day!' This shows that you're aware of her viewing but also keeps it light.
Give her some space. If she's interested, she may eventually start replying. Meanwhile, focus on other aspects of your life and your other friends too. Don't let her lack of reply make you overly obsessed. It could be that she needs time to figure out how she feels about you or how she wants to interact with you.
You could just ignore it. It's her choice not to follow, and if she enjoys your story, that's fine.
I don't think you should be overly concerned. Everyone has different ways of interacting on social media. Some people are more passive. He might be one of those. He could be enjoying your stories at his own pace without feeling the pressure to reply immediately. If it really bothers you, you could try sending him a friendly and non - pushy message to see if he'll start a conversation.
You don't really need to overreact. Just keep posting your stories as you normally would. If you're interested in her, you could try to make your stories more engaging, but don't be pushy.
Perhaps she doesn't know what to say in response. Watching your stories is her way of staying updated on your life without having to come up with a reply. It could also be that she doesn't want to engage in a conversation directly but still wants to be part of your world through your stories.
You could try to initiate a conversation. Since he shows interest in your stories, it might be a good starting point. For example, you can ask him if he liked a particular story of yours.
You could try sending him a friendly message related to one of your stories. For example, if it was about a place you visited, you could ask if he's ever been there.
You could react by simply ignoring it if you don't want to encourage any further interaction.
You could try to engage with her in other ways. Maybe start a conversation about something else that interests both of you. This shows that you're not overly focused on her not watching your stories and gives you a chance to build a better connection. Another option is to privately ask her if there's a reason she doesn't watch your stories. But be prepared for an honest answer that might not be what you want to hear.
Send her a story that's a bit more personal or has a question in it. For example, you could post a picture of a place you like and say 'I wonder if anyone else likes this place as much as I do?'. This might pique her interest and make her more likely to respond to you directly. Since she watches your stories, it's a way to engage her without the pressure of a direct text.
You could just give her some space. Don't push her to interact. If she's interested, she might come around on her own.