Well, in a Loki meets Hela fanfiction, it might start with Loki being forced to meet Hela in Helheim. He could be there on a mission for Thor or Odin. Hela might be intrigued by Loki's presence. She could offer him a deal - his freedom in exchange for helping her gain access to Asgard again. Loki would have to weigh the options and decide if he can trust Hela or if he's just walking into another one of her traps.
In a fanfiction where Loki meets Hela, their interaction would be complex. At first, Loki would be cautious, as he knows Hela's reputation. Hela would be dismissive of Loki, seeing him as a lesser being. But as they start to talk, Loki might share some of his experiences of being ostracized in Asgard. This could pique Hela's interest, as she herself was banished. They might start to exchange stories, and slowly a relationship of mutual understanding could develop. But it would always be a fragile relationship, with Hela's power and Loki's deviousness creating an undercurrent of unease.
In a fanfiction, their relationship might start with a lot of tension. Thor, being the golden child, was always favored, which made Loki jealous. Hela, being older and more powerful, was banished. But a plot could be crafted where Loki discovers a way to bring Hela back. At first, Thor is against it, fearing she'll cause more destruction. But as they interact, they find that they have more in common than they thought, like their love for Asgard in their own ways, and they start to form a bond.
They could embark on a journey to find a lost Asgardian artifact. Thor's strength would be useful for any physical challenges they face, like fighting off monsters guarding the artifact. Loki's trickery could help them get past tricky traps and illusions. Hela, with her death - related powers, could deal with any undead or dark magic they encounter along the way.
In the fanfiction, Thor could be a key factor in Loki's development within the TVA. Since Thor has always had a strong influence on Loki, his presence might make Loki question his actions and motives even more deeply. For example, Thor could remind Loki of their past, both the good and the bad times, which could lead Loki to make different choices within the TVA's framework.
In many comic storylines, Hela is depicted as a powerful foe, but Thor often holds his own and can match or surpass her strength depending on the circumstances.
Hela isn't Loki's daughter in the comic universe. Their characters have separate origins and roles. There's no established connection of that nature between them.