She might try to appeal to Sasuke's past memories and emotions. Since they have a history together, she could remind him of the good times they had, making him have second thoughts about the kidnapping, and then find an opportunity to flee while he is conflicted.
Sakura could also use her intelligence. She might analyze the environment where she is being held captive. If it's a building, she could find its weak points, like a structural flaw in the walls or a loose window. Then, she could use her physical strength, which is not to be underestimated, to break free and escape.
Sakura could use her medical ninjutsu skills to create a distraction. For instance, she might make it seem like she's poisoned herself, causing Sasuke (or whoever is involved in the kidnapping) to get closer, and then she could attack and escape.
They could use their ninja skills. Sasuke might use his Sharingan to find weaknesses in their captors' defenses, and Sakura could use her superhuman strength to break through any physical barriers. Maybe they work together to create a diversion and then make a run for it.
She could also pretend to cooperate with Orochimaru at first. Gain his trust a little bit and then when he least expects it, make her move. Maybe she could ask Orochimaru for some tools or access to certain areas under the pretense of helping him with his work, but in reality, she is setting up her escape.
One possible fanfic could start with Sakura out on a solo mission in a forest. Sasuke, who has been misled by some dark force, sees this as an opportunity to get Sakura for some unknown reason. He uses his ninja skills to quickly subdue her and takes her to a hidden cave. Sakura is shocked and tries to reason with him, but Sasuke seems to be in a trance. Meanwhile, Naruto and the others start to search for her when they realize she's missing.
Sakura would probably be initially shocked and angry. She has always cared about Sasuke, and this betrayal would hit her hard. But she is also a strong - willed ninja. So, she would quickly gather her wits and start looking for ways to escape. She might try to use her knowledge of Sasuke's fighting style against him if she gets the chance.
Sakura might have a hidden jutsu or power that she has not yet fully explored. In this dire situation, she could tap into this unknown ability to break free from the snakes. For example, she could have some latent chakra - based power that she discovers can repel or dissolve the snakes binding her.
Well, they could start with Sasuke being hesitant about the pregnancy at first, but then as he sees Sakura's determination and love, he warms up to the idea. This could strengthen their bond.
Well, it's not really ethical. Sasuke should be more upfront and find other ways to escape rather than using Sakura like that. Sakura trusts Sasuke and for him to seduce her just for his own gain, like escaping, is wrong. Fanfiction might play with these concepts in different ways, but overall it's a behavior that doesn't sit right. It also doesn't fit well with Sasuke's character development in the original story where he is trying to become more than just a self - centered person.
Sakura might initially be very angry. She has her own strength and pride, and being kidnapped by Sasuke, someone she once cared for deeply, would be a huge blow to her self - esteem. She could try to fight back immediately, using her medical ninjutsu skills and combat training to attempt an escape.
She might be extremely hurt. Sakura has deep feelings for Sasuke, and realizing that he is using her in such a way would be a huge blow to her. She could feel betrayed and angry, and might lash out at him immediately.
She could try to appeal to Sasuke's emotions. If she can remind him of their past, of the times they fought together and cared for each other, it might make him release her. Sakura could talk about their shared experiences and how they are on the same side deep down, hoping to break through whatever is making Sasuke hold her captive.