Her friends could take care of her. For instance, Yuki might bring her some herbal tea that he made himself, believing it would help with her illness.
It could be that tohru's family members in the fanfiction take care of her. If she has an older sister - like figure, she would be there constantly, fluffing her pillows and making sure she is comfortable. Her younger siblings, if there are any, might draw pictures for her to cheer her up. And of course, her mother - figure in the story, if there is one, would be the most doting, cooking all of tohru's favorite foods once she starts to recover a little.
In the 'tohru gets sick fanfiction', it's likely that Kyo would also step up to take care of tohru. Despite their usual bickering, he would feel a sense of protectiveness over her when she is sick. He might sit by her bedside, grumbling about how she should be more careful, but still making sure she has everything she needs. Also, Shigure could use his resources to get the best medical help for tohru. He would probably offer some wise - cracking remarks to lighten the mood while still ensuring she is being taken care of.
In the 'tohru gets sick fanfiction', perhaps her friends would be very worried about her. They might take turns to take care of her, bringing her warm soup and making sure she takes her medicine on time.
Thor could be one of the first to take care of Loki. Despite their differences, Thor still cares about his brother. He would use his strength to protect Loki from any threats while Loki is sick and might even search for rare remedies.
Gwen could also take care of Ben. As his cousin, she would be worried about him. She might use her magic to try and ease his symptoms or find a cure. She would probably make him some soup and keep him company while he's sick.
His best friend could be the one to take care of him. This friend would stay by his side, make sure he takes his medicine on time, and keep him company while he's sick.
One possible plotline could be that Tohru gets physically hurt during an accident while helping out at the Sohma house. Maybe she's climbing a ladder to fix something on the roof and slips, resulting in a sprained ankle or a cut. Another could be that she gets emotionally hurt when she overhears some of the Sohma family members saying unkind things about her, not realizing she can hear them. It could make her question her place in their lives.
Yuki would likely be very concerned. He has a soft spot for Tohru and would probably rush to her side, trying to find a way to help. He might even blame himself if he thinks he could have prevented it. Kyo, on the other hand, would initially be angry, but that's just his way of showing worry. He would be more hands - on in getting her the help she needs.
His teammates, Sasuke and Sakura, would surely be involved. Sasuke, although he may not show it as much, still cares about Naruto. He would keep an eye on Naruto's condition, and if there was any sign of danger, he would be ready to protect him. Sakura would be more hands - on with the medical care, checking his temperature, giving him medicine, and making sure he rests properly.
Sango could also take care of Kagome. As a strong and kind - hearted woman, she would know how to nurse Kagome back to health. She might use her knowledge of herbs and remedies to make Kagome feel better. Plus, she would offer emotional support to Kagome during her illness.
Mr. Burns might try to take care of him. Despite their strange relationship, Burns could feel some sense of responsibility or concern for his loyal assistant.
Carly would probably be the first one to take care of Sam. They're best friends, after all. She'd bring her soup and make sure she has enough blankets.