Well, in many fanfictions, it could be that she has some sort of information that the mob doesn't want her to have. Maybe she overheard something or found out a secret that could put the mob in a bad light. So, to avoid being silenced or worse, she runs away. For example, she could have learned about their illegal activities and they are after her to stop her from revealing it.
Bella could develop a stronger sense of survival. In the face of the mob's threat, she has to constantly be on the lookout for danger. This would make her more aware of her surroundings and better at finding ways to stay alive. For instance, she might learn how to hide, find safe places to stay, and avoid being detected. As she overcomes various challenges during her escape, she may also gain more confidence in her abilities. Initially, she might be very scared and unsure, but as she manages to evade the mob's pursuit, she realizes that she is capable of much more than she thought.
There are several possible reasons. Firstly, a sense of being controlled. If Edward is constantly making decisions for her or restricting her actions, Bella would want to break free. Secondly, self - preservation. If she realizes that the relationship is putting her in more danger than she can handle, she'll run. Thirdly, a change in her feelings. Maybe she falls out of love with Edward or realizes she was never truly in love, but rather in some sort of infatuation. So, she runs away to sort out her emotions and her life.
Another reason could be that she wants to explore the world on her own terms. In the fanfiction, Mirabel may be tired of always being in the family's protective bubble. She desires to see what lies beyond the village and the mountains, so she runs away to start her own adventure.
One possible reason could be fear. Minato is a very powerful shinobi, and Naruto might be scared of him for some reason. Maybe he has heard stories about Minato that made him afraid.
Perhaps he is running away from danger in Konoha. There could be a threat that he believes he can't face directly in the village, and he thinks Whirlpool might offer some sort of sanctuary or a way to become stronger in relative safety.
Maybe he's running away from some kind of danger or threat in his home village. There could be a group or an individual after him, and he believes that Kumo would be a safer place. It could also be related to some political unrest in Konoha that makes him feel like he has to leave, and Kumo seems like a viable option.
Maybe he's running away from the pressure in the village. There are always high expectations on him, and he might feel suffocated and need some time alone to figure things out.
He could run to the Forbidden Forest. It's a place full of mystery and danger, but also a good hiding place as it's vast and not many people would expect him to be there. He might find some solace among the magical creatures there.
Another reason could be to regain her self - esteem. In an abusive relationship, the abuser often tries to break down the victim's self - confidence. By running away, Bella is taking a step towards reclaiming her sense of self - worth. She can start to focus on her own needs and desires again.
Perhaps Naruto feels that Kushina is being overprotective. He wants to prove his independence and go on his own adventures without her constant supervision, so he decides to run away.