She might be empathetic. Since Hermione is a kind - hearted character, she would probably first show understanding. For example, if it's a fear of failure, she could offer words of encouragement, like 'Don't worry, everyone fails sometimes, and it's how we learn from it that matters.'
A fear of betrayal could also be very common. In the world of magic, there are often secrets and rivalries. A character might fear that their closest friend or ally would betray them, perhaps by revealing a secret or turning against them in a crucial moment, like during a battle or a competition.
Well, Hermione is known for her intelligence and rational thinking. When she sees Harry's scars, she might first try to analyze them. Maybe she'd wonder about the magic that caused them, and if there are any lingering effects. This could lead her to research more about dark magic or the spells that left those marks. At the same time, she'd also have an emotional response, perhaps feeling a bit of anger towards those who hurt Harry.
She could be afraid of failing in her studies. Given Hermione's high - achieving nature, the fear of not being the best or making a mistake in her academic pursuits is likely. Another possibility is the fear of dark magic, especially considering the dangerous situations she often gets into at Hogwarts.
Another possibility is that Harry is initially shocked that Hermione saw, but then he uses it as an opportunity to show off a bit more. He could start flexing and say something like 'Yeah, been training hard for the next Quidditch match.' This would be a more confident and perhaps a bit of a cocky reaction from Harry, which could be an interesting twist in the fanfiction.
She would be devastated. Hermione is a very emotional person deep down. She might isolate herself at first, not wanting to talk to anyone, even her closest friends like Harry and Ron. She'll probably go through a phase of denial, not believing that her parents are really gone.
She might feel heartbroken. In many fanfictions, Hermione has deep feelings for Ron, so seeing him with Lavender could shatter her world. She could initially be in shock and disbelief, and then it might turn into anger or deep sadness as she tries to come to terms with what she saw.
Hermione could react by using her intelligence to expose Fleur's betrayal. She might start gathering evidence of what Fleur has done wrong and present it to their mutual friends or to an authority figure in the wizarding world.
Hermione might be shocked at first. She has always seen Draco as an adversary, so a neck kiss from him would be completely unexpected. She could push him away immediately and demand an explanation.
Harry would probably be very supportive. He knows what it's like to grow up without parents, and he would see Hermione's decision as a very kind and noble one. He might offer to help in any way he can, like teaching the child some of his own skills in magic or defense against the dark arts.
Hermione would probably be defiant at first. She's not one to take injustice lying down.