Can't find fishing spot

My sim is now in the utopian future, where the floating flowers for the rainbow snail are not appearing on the water. She had successfully caught them before I went back and sent her to the dystopian future without buying a house instead. But now it's the opposite again. I thought it would work this time, because one of the tests I did last night was to start where she was about to leave for the utopian future and change it to dystopian instead. The floating debris for the three-eyed fish weren't there that time either. So I concluded it must be because she had bought a house. Now it appears that no matter which altered future I send her to first, that will be the only one she will be able to catch the mutated fish in. So much for my goal of having her catch all of the fish in the game! The rainbow snail is the only one she hadn't caught, and it looks like she's not going to be able to. Has anyone besides me ever had this happen?