She could also be shocked and a bit scared at first. But then, her medical ninja training kicks in. She might analyze the situation quickly, looking for weaknesses in the snakes' grip. Maybe she tries to use her knowledge of the human body (since she's a medic) to find a way to make the snakes loosen their hold, like targeting pressure points on the snakes if they have any.
In fanfiction, Sasuke's shadow snakes wrapping Sakura could lead to a very tense situation. It might be a part of a battle scenario where Sasuke is initially hostile towards Sakura. Or perhaps it's a miscommunication, and the snakes are used to restrain her before Sasuke realizes his mistake. It could also be a dark - themed fanfiction where Sasuke has turned evil and the snakes are a symbol of his new, menacing power over Sakura.
Sakura could also be more composed in her reaction. Given her growth as a character, she might try to reason with Sasuke first. She could say things like 'Sasuke, I know you must have a reason for this. Let's talk about it.' However, if Sasuke doesn't respond or seems hostile, she may start to feel betrayed. She might then use her medical ninjutsu knowledge to try to find a weakness in the snakes or in Sasuke's technique that is keeping her tied up. She could also start thinking about how she can turn the situation around and make Sasuke see reason.
At first, Sakura might be terrified. After all, being kidnapped is a scary situation. But then, depending on her character development in the fanfiction, she could start to try and reason with Sasuke. She might ask him why he's doing this and try to get him to see the error of his ways.
Another reaction could be that Sakura becomes more determined. His yelling could fuel her desire to prove herself to Sasuke, whether it's in terms of her strength, her loyalty, or her understanding of him. So instead of being deterred, she uses it as motivation to grow and change in the eyes of Sasuke.
In some fanfictions, Sakura may be determined to find Sasuke and bring him back. She could set out on her own journey, facing various challenges along the way, and growing both as a person and as a ninja in the process of trying to reunite with him.
Sakura could also try to stand up for herself. If she believes that Sasuke is being unfair in his anger, she may argue back. For instance, if Sasuke is angry because of a misunderstanding, Sakura might try to clarify the situation and prove her point.
She may initially be angry. Sakura is a proud and strong character. She could confront Sasuke and Ino, demanding an explanation. After that, she might decide to become even stronger, both in her ninja skills and her emotional resilience, to show Sasuke what he's missing.
In some fanfictions, Sakura's reaction could be more complex. She might be hurt not just physically but also emotionally. This could lead her to question her relationship with Sasuke and might cause her to make some big decisions, like whether to continue trying to reach out to him or to cut him off completely.
Sakura might be heartbroken. She's been in love with Sasuke for so long. She could initially go into denial, thinking it's just a temporary thing. Then she might get angry and vow to prove herself to Sasuke, perhaps by becoming an even stronger ninja.
She could be heartbroken. Sakura has always loved Sasuke deeply, so his leaving for Naruto would be a huge blow to her. She might initially be in denial, not believing that Sasuke would choose Naruto over her.