In most comic storylines, Jimmy Olsen isn't a guardian. He's more often involved in reporting and assisting Superman rather than having a guardian role.
I'm pretty sure it's not real. There's no concrete evidence or reliable source to confirm its authenticity. It could just be a story someone came up with for entertainment.
Often, there are themes related to her stardom and the pressures of being in the public eye. Fanfics might depict how she deals with paparazzi, rumors, and the expectations of her fans. Also, her off - screen personality and her friendships in Hollywood are sometimes explored in fanfic.
I'm not sure specifically which 'Greg Olsen' you're referring to. There could be many people named Greg Olsen. If he's a journalist, his top stories might be about current events, politics, or human - interest pieces. Without more context, it's hard to say.