It's difficult to say just with what she wrote.
If she's more a shy girl, well, sure, she
likes you, as this text is pretty developed and precise and means to please you on precise and true (for what I can know...) points.
But if she's usually at ease, speakes a lot, is usually smiling, etc, well, it's just her nature and a fine way of saying positive things on people (a thing which has been lost, recently...). No special hope in that case.
Can you read other students' yearbooks ?
Didn't you see what she wrote in other student's yearbooks when you were yourself signing them ?
(Oh and of course, your pig comparison is disgusting, of course, and I must condemn it !
)