The story could end with her being in a hybrid state. Not fully human and not fully cat. She then has to learn to live with this new form and find a place in both the human and animal worlds. This can lead to all sorts of interesting scenarios, like trying to communicate with humans who don't understand her half - cat nature, and at the same time, dealing with the instincts of a cat while still having some human emotions and memories.
In some cases, she could choose to stay as a cat. She may have found a new sense of freedom or purpose in her feline form and decides not to return to being a human. She might then live out her days in the cat world, making new friends among the animals and having all kinds of adventures. However, this usually comes with a realization that she is leaving behind her human life and relationships. There could also be a bittersweet moment where she says goodbye to the people she loves in a way that only a cat can, and then embarks on her new feline - only life.
Often, she might be turned back into a human. Maybe a kind wizard or a magical spell reverses the transformation.
She probably has to adapt to moving around on four legs instead of two. Her perspective of the world also changes. Things that were easy to reach as a human are now out of reach or difficult to access.
Well, often in such fanfiction, the change might lead to new relationship dynamics. Sasuke as a girl could have different interactions with Naruto, for example. Maybe there would be more emotional and less combative exchanges at first. The story could explore how Sasuke deals with this new form and the reactions of other characters in the Naruto universe like Sakura, who might be jealous or more protective.
It could end with her realizing she needs to make a change and starting to exercise and eat healthier, and gradually losing the weight she gained.
It could end with them falling in love and getting married. They build a life together, start a family, and are happy ever after.
It can also be used to explore different aspects of the characters. The girl in cat form might have different behaviors and instincts that play into the relationship. Maybe she's more playful or shy as a cat, and this affects how the romance develops. The transformation can also create some comical situations, like when she accidentally knocks things over in cat form, which can be a source of bonding between the characters.
Often, it ends happily with the two of them overcoming all the obstacles and getting married. They prove that love is more important than money or social class.
Often, they either change for the better together and build a more positive life. For example, they might start a small business together using their street - smart skills in a legal way.
Often, they end up together happily. Despite the initial differences in their economic status, they overcome all the obstacles like family disapproval and social pressure, and their love prevails.
It could end happily, like the two people who have been writing letters finally meet in person and get married.
Mostly, it ends with a happy and heartwarming scene, like the family all together enjoying Christmas.