Annabeth could be annoyed. If she doesn't understand why Percy is staring, she might think he's being rude or wasting time. So she could give him a sharp look or a sarcastic comment to snap him out of it.
She might be initially very angry. Annabeth is intelligent and perceptive, so she would likely feel betrayed that Percy thought he could deceive her. For example, if Percy lies about a mission, she could find out the truth later and confront him immediately, demanding an explanation.
He could become withdrawn. Percy is a sensitive person at heart. So if Annabeth's actions are really hurtful, like if she cheats on him in a fanfic (although it's a very sad scenario), he would likely isolate himself from her and their friends. He might go off on his own to think things through and deal with his pain privately.
Annabeth might be initially in awe of Percy's new godly status. But she would quickly start thinking about how to use this new situation to their advantage. She is practical, so she would likely start planning how they can better protect their friends and the world.
She might be shocked at first. Since they are usually comrades or friends, Percy screaming at her is out of the ordinary, so she could just stand there in disbelief for a moment.
She might initially be shocked. Annabeth is a strong character, so she could start by trying to stand up to Percy verbally, asking him why he's being so mean.
After the initial shock and anger, she would start thinking rationally. Annabeth is known for her strategic mind. So she'd start observing the situation, looking for any weaknesses in the captors' setup, any tools she could use to her advantage, all while trying to keep Percy's spirits up during the torture.
Annabeth could also be angry, not at Percy but at the situation or the forces that led to his death. She might vow revenge and start on a journey to find out who or what was responsible for Percy's sacrifice and make them pay. This could lead her into a whole new set of adventures and challenges as she tries to come to terms with her loss.
She might be heartbroken at first. She could try to jog Percy's memory by showing him things that were important to them.
She's probably super excited. She might run and give him a big hug right away.
He could also become withdrawn and depressed. Percy and Annabeth have a very strong bond, and her death would leave a huge void in his life. He might isolate himself from his friends and family, lost in his grief and memories of her.