Do 你 think Rain truly loved Spirit? She wasn't nice to him at first and was very hostile and treated him badly, which made me think she hated him, if she did 爱情 him what do 你 think made her change her mind about him?
I think she dint understand him at first and if 你 think about it spirit dint understand her ether he thought she was 表演 like a yearling acka a baby but later on there 爱情 grew and one 日 as 你 saw they were together in sprits homeland
She was hostile towards Spirit at first because Spirit was 表演 like an ass. He charged Little Creek and threatened him and that's why Rain was furious at him.
She didn't like him at first because he was a stranger who wasn't nice to her human.
If yo pay attention to the 音乐 montage, 你 can tell it takes place over the course of several weeks at least. 你 can tell 由 the changes in the length of his mane. Short buzzed, slightly longer when little creek tries to paint him/when he meets the little girl, to even longer when he gets rain the apple.
during this time the two bond and spirit learn to 爱情 his new life and care for the humans around him. she changes her mind because they get to know eachother.