A love letter (platonic) between friends

The concept is that while Willow is in a 'mental hospital' (in season 7) she recieves a letter from Buffy that warms her heart. The relationship between those ladies to me seems only sisterly. Also, Willow, due to the stories I have read, strikes me as somebody who'd care about life, so: Pro-Life Willow. Buffy also objects to monsters, and this includes human monsters, so...