Perhaps she's in a state of shock. If she has witnessed something extremely traumatic, like the death of a loved one or a violent event, it might cause her body to go into shock, making her unable to move for a while.
Maybe she's injured. In many fanfics, characters can get hurt in various ways, like a fall from a horse or an accident, which could lead to her being unable to move.
This situation can also be a turning point in the story. It could force Amy to re - evaluate her life and goals. While she's unable to move, she has time to think about things she might not have considered before, like her true feelings for someone or her future plans, and this internal change can then drive the rest of the plot forward.
Well, perhaps in the fanfic, Amy Fleming gets an infection after helping a sick animal. She starts to experience symptoms like fatigue and fever. The story could revolve around her struggle to keep up with her daily tasks at Heartland. Her family notices something is wrong, but she brushes it off at first. As the infection gets worse, she finally has to accept help and they all work together to find a treatment.
One possible storyline could be that Amy Fleming is injured while riding her horse. Maybe she takes a bad fall during a jump and has to deal with a broken leg. She then has to rely on her friends and family at Heartland to take care of her and her horse while she recovers.
One possible plot could be that Amy Fleming starts having vivid flashbacks of a past trauma. These memories start to affect her daily life, and she has to find a way to deal with them. Maybe she seeks help from a friend or a professional.
One possible cause could be improper grammar or spelling that disrupts the flow, like incorrect verb tenses. Another might be the use of cliched or overused plot elements which 'infect' the originality of the fanfic.
Another possibility is that she's been under a lot of stress lately. There could be a lot of things going wrong at the same time on the ranch, like financial problems, problems with the animals, and then getting sick on top of all that is just too much for her to handle, so she freaks out.
Another plot could involve her friends and family coming to visit her at home during the pregnancy. They bring her gifts and support, but also some of them might have different opinions on how she should be handling the pregnancy, which leads to some minor conflicts. For example, her mother might want her to move back home, but Amy wants to stay independent in her own place.
Perhaps in the fanfic, her being sick for days is a sign of something more mysterious. It could be that she was exposed to a strange substance, and as she's sick, she starts having strange dreams or visions that are related to some big event in the story's universe.
Definitely Ty Borden. He and Amy have a special relationship, so he would be deeply concerned about her illness. He could be the one running errands, getting medicine and making sure she has everything she needs. Georgie could also be a main character. She could be helping Lou with the ranch work and also spending time with Amy, telling her stories to keep her spirits up. And then there's Spartan, Amy's horse. Spartan could be acting strangely because he senses something is wrong with Amy, and his behavior could be a part of the story as well.
Her sister could be worried about her and constantly check on her, bringing her warm soup and medicine. Her friends at the stables might offer to take over some of her horse - care duties so she can rest.