She might be watching with other family members. Perhaps her children are sitting beside her, and while they may not be fully interested in the'stories', they are just keeping her company. Or it could be her partner, and they are sharing this time of relaxation together.
Definitely not. Everyone has the right to their own privacy, and these kinds of stories are extremely private. If you are exposed to such without permission, it's wrong and unethical behavior.
It could be that the stories are a form of escapism for her. In her daily life, she might have a lot of stress or boredom, and the stories she watches offer her a different world to get lost in. They might have characters she can relate to or plots that she finds fascinating. For instance, if they are love stories, she may be a romantic at heart and enjoy following the relationships in the stories. Also, it could be that she has a particular interest in the genre of the stories, like mystery or fantasy, and she can't wait to see how each one unfolds.
Maybe you're just not interested in her content. There could be many reasons. For example, her stories might be too similar to others you've seen, or perhaps her topics don't resonate with you.
It depends on how you feel about it. If it makes you uncomfortable or is a distraction, then yes, you should stop. But if you enjoy them and they don't have a negative impact on you, there's no reason to stop.
The appeal might be in getting a glimpse into her daily routine. It could be interesting to see how she prepares for the day or relaxes after a long day through these 'shower stories'.
One benefit could be relaxation. Sleep stories are often designed to calm the mind, and by watching them, you can unwind. Also, it might enhance your creativity as these stories can take you to different imaginative worlds. And it could strengthen the bond between you and her, as sharing this kind of peaceful moment can be very intimate.