I doubt that your daughter is trying to trick you, but she sure does sound tense and anxious and is casting about for any possible way to deal with her fear. I'm not sure from your request whether she's peeing while awake or asleep, but either way, it's most likely either a desperate ploy to keep you with her a little longer, or the natural outcome of tension, exhausted sleep, and possibly vivid dreams.
At your daughter's age, it's hard to separate reality from imagination, and it's entirely normal to develop new fears. The fever could have been a catalyst, since fevers can induce nightmares and hallucinations. I remember being terrified of the dark when I was quite young, and that seemed to follow a severe illness. My grandmother was sleeping with me, and she told me I sat up in bed, pointed out the upper-story window, and said, "Take those eggs away!" Nightmares lasted for quite a long time after.
Generally, the LEAST effective way to banish fear in a child is to try to convince her there's no reason for it. What works better is to empower the child to find ways to face the fear herself.
For awhile around your daughter's age, my grandson was afraid to go down a dark hallway to his room, because there was a cartoonish picture of a bear family hanging there in the gloom. So I asked him what things he could do about being afraid. He came up with a pretty impressive list of ways to empower himself, including carrying a flashlight, growling at the picture, getting an adult to accompany him, not looking at the picture, telling the bears to look the other way, or telling them to hold still until he passed. Funny, he never asked that the picture be taken down. But we supported his ideas, and he tried a number of them, and got through the scary period that lasted maybe three or four months.
Turns out, this is essentially the approach suggested in the very fine parenting book, How to Talk So Kids Will Listen, and Listen So Kids Will Talk, by Faber and Mazlish. The techniques and ideas are respectful to the needs of both adult and child, and they work without creating additional stress.