Dumbledore could play a crucial role in her rescue. He has great wisdom and powerful magic. He might sense that Hermione is in danger through his magical connections. Then he could send some of the more skilled members of the Order of the Phoenix, like Sirius or Lupin, to find and rescue her. They would be able to use their combat skills and magic to overpower Rabastian.
One possible plot could be that Rabastian has some dark motives related to Hermione's magic abilities. Maybe he wants to use her knowledge of spells and potions for his own evil schemes. He could hold her in a secret location, and Hermione would have to use her wits to try and escape or send out some sort of magical signal for help.
In most of these fanfictions, Hermione reacts with her characteristic intelligence. For example, in 'The Captive Hermione by Greyback', she immediately starts to analyze her surroundings and look for possible escape routes. She uses her knowledge of spells and potions to try and gain an advantage over Greyback.
Hermione would likely react with her usual intelligence and quick - thinking. She might start by trying to analyze Dolohov's motives and weaknesses. She could also try to find a way to communicate with the outside world, perhaps using magic in a very discreet way.
Hermione would likely be defiant at first. She is a brave and strong - willed character. So, she would probably try to resist Narcissa's attempts to intimidate her and would look for ways to escape immediately.
Obviously, Harry Potter could be the one to save her. He has a strong bond with Hermione and is very brave. He'd stop at nothing to rescue his friend. He might use some of his unique magical abilities, like his connection to Voldemort, to find her.
Hermione would likely be very angry at first. She is a strong - willed character and being kidnapped would go against all her principles of freedom and rights. She would probably try to reason with Ron immediately, using her logical arguments to make him see how wrong his actions are.
At first, their relationship would be very strained due to the kidnapping. But as the story goes on, they could start to understand each other's motives. For example, if Harry was forced to kidnap her for a noble reason, Hermione might gradually forgive him. Their relationship could then develop into a deeper friendship with more mutual respect.
Hermione might try to escape by using her intelligence to analyze Tom Riddle's lair. She could look for any weaknesses in the magical protections he has set up. For instance, if there are any magical runes, she could try to decipher them and find a way to disable them. She might also use her knowledge of potions to create a distraction. Maybe she could brew a potion that creates a thick fog or some other effect that would allow her to slip away unnoticed.
In some fanfictions, Hermione might use her wits to try and outsmart Voldemort. For example, she could pretend to be on his side while secretly planning an escape or a way to undermine his plans. She's very intelligent, so she could try to find a weakness in Voldemort's defenses or his followers.
In some fanfictions where Draco kidnaps Hermione, his motivation could be related to family pride. The Malfoy family has long - held grudges against the 'Muggle - born' status that Hermione represents in the wizarding world. He might see kidnapping her as a way to assert the superiority of pure - blood wizards. Another possible motivation could be jealousy. Draco may be jealous of Hermione's intelligence and close relationships with Harry and Ron. By kidnapping her, he could try to break those bonds and prove himself more powerful.