Searching for princess tales with proper endings online gets frustrating—so many promising ones just stop updating. After hunting through dozens, a few stand out because they actually finish what they start.
'Bitterblue' by Kristin Cashore is available through certain library ebook apps, and it's a full, self-contained novel. The protagonist inherits a shattered kingdom, and the story deals with the messy aftermath of trauma and ruling, not just romance. It concludes her arc from the earlier 'Graceling' books but works on its own.
For something different, Naomi Novik's 'Spinning Silver' has official digital copies. It's a complete fairy-tale retelling where the 'princess' figure is a moneylender's daughter, and the resolution involves outsmarting both supernatural threats and human greed. The ending ties up all the magical bargains neatly.
My last reliable pick is the web novel 'The Princess Will Save You' on platforms like Radish. It's a completed serial that flips the damsel trope—when the prince is kidnapped, the princess goes on the rescue mission. The final chapters wrap up the political conspiracy cleanly, which I appreciated after too many abandoned stories.