It could mean she trusts you. She might consider you a close friend and wants to share more personal aspects of her life with you that she doesn't want to be public.
Well, it might be that she has a special interest in you. She could be thinking that you are someone who would understand or appreciate the things she'll post in her private story. It's like she's creating a more intimate sharing space just for you and perhaps a few other selected people.
It could mean she trusts you and wants to share more personal or exclusive content with you. Maybe she considers you a close friend or is interested in getting closer to you.
It can signify that she sees you as someone special and wants to involve you more in her inner world. It could be a flirtatious gesture or just a friendly way of sharing intimate moments, but it's often a positive sign.
Yes, it can be normal. Maybe she has seen you around, like in a common group or event, and wants to share more personal things with you in a semi - private way. It could also be that she just wants to expand her private story audience.
You could start by simply acknowledging the addition. For example, send a quick 'Hello' or a smiley face. However, if you're not interested in engaging with her, it's also okay to just leave it be. But if you do decide to interact, keep the conversation light and friendly at first. Ask general questions like 'How are you today?' or make a comment about something in her profile picture or bio if there is one.
Once there was a couple who had always dreamed of having a big family. They already had a son but really wanted a daughter too. One day, they decided to try for another baby. After months of anticipation, the wife became pregnant. During the pregnancy, they were filled with excitement and a bit of nervousness. Finally, a beautiful girl was born. The couple was overjoyed and their son was also very excited to have a little sister. They all lived happily ever after.