She could be initially shocked. After all, Isabela has always been her sister and she might not have expected such aggression from her.
Mirabel might try to talk to Isabela. She is a kind - hearted character, so she may try to reason with Isabela, asking her why she is doing this and trying to resolve the conflict verbally.
It could also be due to long - hidden family tensions. Isabela might have bottled up her frustrations and unknowingly takes them out on Mirabel. For example, the pressure she has been under to always be proper and present a certain image in the family, and when Mirabel starts to question things, Isabela snaps.
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 hurt at first. But Mirabel could also be determined to prove herself to Alma.
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.
At first, Mirabel might be shocked and confused. She would probably wonder why Abuela would do such a thing to her. She could spend her initial time in prison trying to figure out what she did wrong or if there was some mistake.
Characters may also react with confusion. Vines fanfiction can sometimes be very strange or abstract, especially if it combines different elements in unexpected ways. So they might scratch their heads trying to understand what's going on. For example, if it has a mash - up of different genres and timelines, it can be quite bewildering.
The younger characters in Encanto like Antonio would be excited. He loves stories and new ideas, so Mirabel fanfiction would be like a new adventure for him. He might want to share it with his animal friends. And Dolores, with her ability to hear everything, might already know about the fanfiction. She could be either intrigued or a bit worried depending on how the fanfiction is being received by the rest of the village. If it's causing a stir, she might be concerned about the family's reputation, but if it's positive, she would likely be quietly supportive.
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.