>>2818803You could make the short-term work depending on what flavour of desperation you're going for. If you want "I've tried everything except this and just want out" or "everyone resets anyways so I slowly stopped caring" then you kinda have to go long, but "it makes a perverse amount of sense, maybe this will work?" could be compatible with earlier timeframes.
If you want to take the long route, you could write shorter and shorter scenes showing her increasingly desperate and exotic ideas, just glimpses by the end, until she snaps and reaches the epiphany you need her to reach. If you go the short route, you might want to foreshadow the idea (or something that could be built into the idea) early on and then have her momentarily chew on it once or twice over the rest of the first three days.
As for what she's like at the end, I confess I would love if the nudity continued in some sense beyond the loop, whether that's because she's hooked on it or if she just got too used to the time loop and her mental autopilot still leads her to lewd situations. It'd just be such a shame for it to end with her just putting the incident behind her and trying her best to never think about it again. Any ending where the embarrassing days continue in some capacity or another is a great ending in my books.