Please help me

Yes.you must complete the 9 harvest jewels,give her flowers every day and ask permission to carter to marry her.

Just collect all the 9 jewels which can be found at:

Jewel Of Truth Locations
Once you purchase the Shelves from the TV Shopping show, you can start searching for the Jewels of Truth. Here's a list of where to find some of them. 1) On your dog house's roof
2) The water trough in your horse's barn
3) Purchase from Won ($50,000)
4) Trade 1000 medals at the Horse Race
5) Inspect the lampposts between the Church and Rose Plaza
6) On the second floor of the library, inspect the center right-most shelf
7) Play the New Year's game show on the TV inside the town cottage
8) Inspect the calendar in the mountain cottage (it falls out)
9) Take all eight of the above gems to Thomas' house; inspect his refrigerator

After that, give her flowers everyday in the pond near the hotspring. And after
That ask permission to Carter ( the priest ) to marry her.

Hope it helps..