First of all, the nameless beach one which you mentioned in your previous post. To do this one you need to first figure out exactly which day it's on. Most likely the problem you're encountering finding this one is the timing. Although the fairy says she's on the beach at night, it should technically say early early morning because the time to be there is the same day she says it at 0:10 until whenever she vanishes. If you try going at the end of the day you'll find nothing.
If I recall correctly, fishing ones all state that she is out fishing.
It's been quite a while since I played through the whole game, so the only ones I can think of off where she is inside a building is in the smithing cave in town, or the slime cave at the rest area with the bed.