Social media groups focused on DC Comics or Power Girl in particular can be a good source. For example, on Facebook or Reddit, there are groups where fans discuss all aspects of the character. Sometimes, members will post links to their own fanfictions or know of some great ones. You just need to be active in the group, ask around, and keep an eye out for any relevant posts.
You can try fanfiction websites like Archive of Our Own. There are often a great number of fanfictions dedicated to various characters, including Power Girl. Just search for 'Power Girl Karen Barefoot' on the site and you'll likely find some interesting reads.
Chapter 265, "This Time You Must Help Me", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter turns that into something concrete by moving from As expected, the truth behind the video was unearthed one by one and...
Chapter 612, "There's been an accident on the show!", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. It opens with His family's residence used the mortise and tenon structure in many...
Chapter 581, "Where is everyone? Where have they all gone?!", is the clearest early answer because it turns Are's situation into a concrete plot event.
Chapter 537, "Ding, Jiang Cheng's affinity drops by 10 points!", is the clearest early answer because it turns Zhuola's situation into a concrete plot event. The chapter turns that into something concrete by moving from Miss Su Yinwan immediately hung her head in dejection.
Chapter 812, "You’re Extorting Money!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, Jiang Li actually called the police!. By the end, It's simple, just sign an IOU, pay one hundred a month, and ten years....
Chapter 229, "He's Actually Brother Liu, the Watermelon Seller?!", is the clearest early answer because it turns Huo's situation into a concrete plot event. Early on, Huo Ziyang's face had already turned deathly pale.. By the end, Isn't it enough to teach a child a lesson when he makes a mistake?.
Chapter 242, "Jiang Yan's Dazzling Transformation Journey", is the clearest early answer because it pushes Shining Transformation Trip into a new phase or setting. It opens with Just when Jiang Yan called to heaven and earth in vain, he looked up...
Chapter 606, "Are There Crocodiles?!", is the clearest early answer because it turns Ji Yanbai's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Hearing Ji Yanbai volunteer to stay behind, everyone ceased to have...
Chapter 400, "Arriving at Yan City", is the clearest early answer because it pushes Lili into a new phase or setting.
Chapter 586, "She Just Likes Men Who Show Weakness Initiative", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Yan quickly swam over to the person.