She could also use her influence within the Gryffindor house and among her friends to try and change their opinions of Harry. Ginny might tell them about all the times Harry has saved them in the past and how he's not to blame for whatever has made him an outcast. She may also help him with his studies or magical training if he's being ostracized from group activities in those areas.
Ginny might support Harry by simply being there for him. In the face of everyone else turning their backs, her presence can be a great comfort. For example, she could sit with him at meals when no one else will.
Ginny could be very vocal in her support of Harry. She might publicly defend him against false rumors and accusations. She could also help him in more practical ways, like sneaking him food or supplies if he's being isolated in a particular area of the castle. Ginny's loyalty and love for Harry would drive her to do whatever it takes to make his situation better, even if it means going against the tide of public opinion at Hogwarts.
One possible storyline could be that Harry is wrongly accused of something at Hogwarts, which makes him an outcast. Ginny, being the strong - willed character she is, might be one of the few who still believe in Harry. She could secretly help him clear his name while also developing deeper feelings for him during this difficult time.
Emotionally, Ginny is Harry's rock. She creates a safe space for him to express his emotions. When Harry is feeling guilty about the deaths during the war, Ginny gently reminds him that he did all he could. She uses her own strength to lift Harry up. Ginny might also introduce Harry to new activities like Muggle painting. Through this, Harry is able to focus on something creative and positive, and Ginny is there to cheer him on every step of the way. She gives him unconditional love and acceptance, which is crucial for his healing process.
Ginny would also support Harry by involving him in her own life. She'd share her dreams, her daily experiences at work or with friends. This would make Harry feel like he was still an important part of her world and not just someone she was taking care of. She might even try to find magical solutions to his condition, perhaps researching ancient spells or potions that could potentially help him regain some mobility.
She might directly ask him about her suspicions. Just come out and say 'Harry, I think you're cheating on me. I've noticed you acting strange lately.'
Ginny might initially be heartbroken. She could retreat into herself, feeling betrayed and confused. In some fanfictions, she may cut off all contact with Harry immediately.
In this fanfiction, Harry could comfort Ginny through his words. He might tell her that what happened in the Chamber was not her fault. He could share his own experiences of facing difficult situations and how he overcame them, making Ginny feel that she too can get through this tough time. For example, he could say something like 'I've been through a lot of scary things too, Ginny, and we've always come out stronger in the end.'
In fanfiction, anything can happen. However, if Ginny cheats on Harry, it would likely shatter the trust in their relationship. It could lead to a downward spiral in the story, with Harry feeling betrayed and perhaps seeking revenge or just distancing himself. This could also change the dynamic among their friends and family, as everyone would be caught in the middle of this drama.
Harry might immediately rush to her side and comfort her. He could put his arm around her and ask her what's wrong in a gentle voice.
Ginny could be heartbroken. She might initially be in denial, thinking that Harry will change his mind. She has loved Harry for a long time and expected a future together, so this refusal would be a huge blow to her emotions.
Ginny could be heartbroken. She might have expected to marry Harry after all they've been through together. She could initially go into a state of shock and disbelief, not understanding why Harry has refused.