This is a complex issue. In the context of fanfiction, creating a character as a 'paid whore' is highly unethical and goes against the positive values associated with the 'Hermione' character from the Hogwarts series. Hermione is a symbol of intelligence, friendship, and courage. Degrading her in such a way in fanfiction is disrespectful to the original creation and its fans.
There are many alternatives. One could write about Hermione's academic achievements and how she furthered her magical studies at Hogwarts or after. Another option is to explore her relationships in a positive way, like her strong friendship with Harry and Ron. She could also be shown as a leader in the wizarding world, using her intelligence to solve problems and bring about positive change.
I'm not really into that specific kind of fanfiction with such a derogatory term in the title. However, there are many great Hermione fanfiction stories in general on platforms like Archive of Our Own. You can search for Hermione -centric stories that focus on her relationships, adventures, or her growth as a character without having to specifically look for ones with this rather inappropriate -sounding title.
The term 'broke whore' is inappropriate and derogatory. Fanfiction should be a platform for creative and positive exploration of characters. Using such offensive terms in relation to a character like Hermione from the 'Harry Potter' series goes against the spirit of respectful fan creation.
She would probably be very conflicted. Hermione is Harry's friend, and spying on him goes against her loyalty. So she might be constantly struggling with her conscience.
Hermione can be developed by showing her initial resistance to the idea of the collar. She's a strong - willed character, so she might fight against the implications it has. As the story progresses, she could start to find ways to use the situation to her advantage, like using the attention the collar brings to spread awareness about an important cause at Hogwarts, such as equal rights for all magical creatures.
Some great themes could be Hermione's further studies at Hogwarts or her post - Hogwarts research. For example, exploring how she delved deeper into the study of ancient runes or how she contributed to the field of magical law reform.
Another motive might be related to a prophecy or some ancient magic. There could be a prophecy about Harry that certain people want to manipulate or prevent from coming true. By paying Hermione to spy, they hope to get insights into Harry's actions and decisions that might be related to this prophecy.
One common theme is Hermione's intelligence. Fanfictions often explore how she uses her vast knowledge to solve problems at Hogwarts or in the wizarding world. Another theme is her friendship, like her strong bond with Harry and Ron. For example, stories might focus on how they support each other through tough times. Also, her activism for the rights of house - elves is a theme. Some fanfictions show her continuing to fight for their fair treatment even after the main events of the books.
One idea could be Hermione being wrongly accused of a rule-breaking at Hogwarts and as a form of 'punishment' she has to wear a special collar that has some magical properties. For example, it might restrict her magic usage in certain areas of the castle until she proves her innocence. Another plot could involve a mysterious group at Hogwarts that uses collars as a symbol of membership and Hermione gets caught up in it while trying to expose their true motives.