How can you make rei fall in love in ayanami raising project for ds

there is only 3 ways of raising her Affection :
1. Buying her food (Fried Potato raises it by 2 points)
2. Certain event (and choices)
3. After a certain point, when she start smiling you can ask her to wear some other clothes (Like the frilly dress that added 5 points to affection).

I give her fried potato at least once every week and I got her event on the 6th month (but I still miss the event on 5th month)