Friendship turning into love is also a prevalent theme. They start as just family members getting to know each other better, and then it blossoms into something more romantic. Writers often play with their different personalities - Bruno's mysterious nature and Mirabel's optimistic and determined self - to create a unique dynamic that leads to love.
Perhaps she tries to understand Abuela's perspective. Mirabel is a kind - hearted girl, and she may think that there is a reason behind Abuela's actions. So she might try to see things from Abuela's point of view while still feeling the pain of the punishment.
Mirabel might be initially shocked and heartbroken. She loves her family and the village, so being banished would be a huge blow. She could cry and try to plead with Abuela to change her mind.
She might be heartbroken at first. After all, being kicked out by her own abuela is a big blow. But then she could become determined to prove herself. So she might set out to find a way to show that she is an important part of the family even without a magical gift.
It could be her mother. Mothers are often the ones who enforce discipline in the family. Her mother might feel disappointed in Mirabel for lying and give her a punishment to teach her a lesson.
She might lose the trust of her family members. In the Encanto family, trust is crucial. If Mirabel lies and is found out, her family may start to question her honesty in the future.
One great Bruno x Mirabel fanfiction is 'The Unseen Bond' which explores their relationship in a very heartwarming way. It shows how they support each other through the family's challenges.
One possible reason could be that Mirabel might have accidentally broken an important family heirloom. In the context of the Encanto family, their heirlooms are often tied to their magic and family identity. If she damaged something like that, Abuela, who is very protective of the family's traditions and magic, would likely punish her.
Friendship is often a common theme. The fanfictions might explore how Arnold and Carlos develop a deep bond. Another theme could be adventure, where they go on some exciting journey together.