Well, she could betray Percy by revealing his secrets to his enemies. Maybe she's forced to do so under some kind of magical compulsion or threat.
In the fanfiction, Artemis might betray Percy because of a misunderstanding. Perhaps there is some misinformation spread about Percy that makes Artemis believe he has done something terrible. So, without fully investigating, she takes actions that are against Percy, like withdrawing her support or actively working against him in some way.
One way could be that Artemis, in the fanfiction, betrays Percy for the greater good as she sees it. For example, she might think that sacrificing Percy's trust and safety could save her huntresses or prevent a greater evil from befalling the world of the gods. She could give false information about Percy to lead him into a dangerous situation where he is set up to fail or be captured.
Well, perhaps in this fanfiction, Artemis betrays Percy for Orion due to a prophecy. There could be a prophecy that states that Orion and Artemis together will bring about some great change or prevent a huge disaster, and Artemis believes she has to choose Orion over Percy to fulfill it. Also, Orion might have some sort of leverage over Artemis that forces her to turn her back on Percy.
Percy could lose trust in the gods completely. After Artemis' betrayal, he might feel that he can't rely on any of them anymore.
Initially, Percy is likely to be heartbroken. He thought he had a certain relationship with Artemis, whether it was friendship or respect. So when she betrays him for Orion, he may go into a state of self - doubt. He could wonder what he did wrong and start to isolate himself. But as time passes, he may gather his strength and decide to face Artemis and Orion head - on, to either regain Artemis's trust or show her the error of her ways.
It could be that Artemis betrays female Percy out of a sense of duty to the gods' code. Suppose there is a rule among the gods that female Percy has unknowingly broken. Artemis, being a strict adherent to the gods' laws, decides to take action against her. This could involve setting traps or leading her into dangerous situations, all in the name of upholding the divine order.
Another motive could be a difference in ideology. If Percy believes in a different way of handling things compared to Artemis, and he feels that her methods are endangering the world or his loved ones, he might decide to betray her in order to stop her from following her current path.
Some fans might be really shocked. They are used to seeing Artemis as a more or less benevolent figure, so this sudden betrayal would be a big twist. They'd probably be eager to read more to find out the reasons behind it.
Percy could also react with a sense of determination. Instead of being defeated by the injury, he sees it as a challenge. He starts to figure out what made Artemis hurt him in the first place. If it was a misunderstanding, he tries to clear it up. If it was something more malicious, he starts to plot his revenge. He uses his own wits and the powers he has to either heal himself or find a way to make Artemis see the error of her ways. He might also seek the help of his friends, like Annabeth or Grover, to come up with a plan to deal with the situation.
Maybe Artemis is on a hunt when she stumbles upon Percy. She might be initially cautious, as she's a goddess and Percy is a demigod. She could question him about his presence in Texas.
One possible reason could be a misunderstanding. Maybe Percy accidentally disrupted one of Artemis's hunts or sacred rituals in the fanfic. Another reason might be that some prophecy or fate in the fanfic's made - up world has pitted them against each other. For example, if there's a prophecy that Percy's actions will somehow limit Artemis's power or freedom in the future.
It would be complex. Artemis, as his mother, would likely be protective yet conflicted. She has her own identity as a virgin goddess, and Percy's existence challenges that. But she would also love him deeply. Percy would probably look up to her and be in awe of her powers, yet also struggle with the fact that his mother is such an unusual figure in the mythological world. There might be a sense of distance at times because of Artemis's nature, but also an unbreakable bond.