How many items do you give a girl in Harvest Moon DS before she gains another heart color?
That all depends on how much she likes the item you give her. Each item will increase her affection at a different rate. For example; Celia likes Cake the most, when giving her cake her affection goes up by 800 points, Yarn will make it go up by 500, flowers and fruit by 300 and so on. It takes 10,000 points to go from one color to the next. A good way to keep track of this is with the Friendship Bracelet, which you can obtain at the Harvest Casino. I hope this helps!