The ladies had not been long in the drawing-room, before the other ladies, in their different divisions, arrived. Emma watched the entree of her own particular little friend; and if she could not exult in her dignity and grace, she could not only love the blooming sweetness and the artless manner, but could most heartily rejoice in that light, cheerful, unsentimental disposition which allowed her so many alleviations of pleasure, in the midst of the pangs of disappointed affection. There she sat—and who would have guessed how many tears she had been lately shedding?
Emma by Jane Austen chapter 8 volume 2
Here Emma observes her friend Harriet's entry, who was turned down by Mr.Elton.
My question is what does alleviation of pleasure mean?
When I encounter alleviation of X , the X is always something unpleasant like ( pain, headache, suffering). So I'm really confused about its using here.