Actually, no, you can look for multiple items to increase your relationship with her (or just for fun, since some can be rather hard to find). Might as well pump back some interest into the game for those who didn't do that one, as after this is the point of no return where Dekarous became today's Dekarous... known as 5.5.
As noted by Dekarous, you can no longer do the minigame (or gift flowers) if you've beaten Rosita. To go back to before the fight, gotta change her progress variable to 10 (#30 Rosita) and if you want to completely reset her, flip her self-switches as well (event 1 on map 44).
If you haven't done her at all, gift her some roses while you're at it. You get 1 relationship point for every rose above 29 (counting the initial amount which is at least 15).
The items will only appear if you've asked Rosita about them (and for once, it's properly coded for something that processes in a linear way - get job, spawn item, terminate item event, activate next job).
- Basket of Grain: Southeast from the hut, in front of a tree. (27;27)
- Wooden Saw: Northeast of the Deep Woods entrance, in a crimson area surrounded by trees, in front of a tree trunk. (45;59)
- Glowing Pumpkin: Directly north of the Deep Woods entrance, in front of a tree. (6;35)