Bella could also be surprisingly calm. If she has developed a deep understanding of the vampire world and Jasper's character over time, she might believe that there is a reason behind his actions. She may wait patiently for him to explain himself while also observing her surroundings for any possible means of escape or self - defense.
He could try to reason with Sebastian. Kurt is intelligent and articulate. He might try to talk Sebastian out of whatever his plan is, appealing to his better nature or trying to make him see the consequences of his actions.
Carlisle, being the peace - loving and rational leader of the Cullens, would first try to understand Jasper's motives. He would probably try to communicate with Jasper to find out why he has kidnapped Bella and see if there is a way to resolve the situation peacefully.
At first, Bella might be shocked and resistant. She could be filled with a sense of disbelief that such a thing is being forced upon her. After all, in the Twilight universe, Bella has her own feelings and desires, especially when it comes to relationships. Forced marriage goes against her free - willed nature. So, she would probably try to find a way to oppose it, perhaps by seeking help from her friends or looking for a loophole in whatever is forcing this marriage upon her.
Edward might be initially shocked and heartbroken. He has been in love with Bella for a long time, so her leaving for Jasper would be a huge blow. He could become withdrawn and moody, brooding over what went wrong.
In some fanfiction scenarios, Sookie could be surprisingly calm. She has been through a lot in the 'True Blood' world. She might see this as just another challenge. She could start to plan her escape quietly while pretending to go along with Eric's actions, biding her time until she can get away safely.
Rey might initially fight back. She is a strong - willed character, so she would likely use her combat skills and Force abilities to try and escape from Kylo Ren's clutches.
Their friends might be initially shocked. Some, like Alice, might be excited and start planning for the baby's future right away. Others, like Edward, could be more worried about the potential risks to Bella's life.
Her father, Charlie, might try to rescue her. He loves Bella deeply and would be very worried when she goes missing. He could start investigating and find out that the Cullens are involved.
She could also be in a state of shock and disbelief. Not expecting to be forced into such a situation, Bella may initially be paralyzed with fear or confusion. She might not know how to respond and simply go along with it while trying to figure out what to do next.
He could feel concern. Since Bella is a human and often in a vulnerable position, Jasper would be worried about her safety.