(20) "Well, this ain't the way we've thought it was all going to end, is it, Louisa?" said Joe. (21) She shook her head. (22) There was a little quiver on her placid face.

(23) "You let me know if there's ever anything I can do for you," said he. (24) "I ain't ever going to forget you, Louisa." (25) Then he kissed her, and went down the path.

(26) Louisa, all alone by herself that night, wept a little, she hardly knew why; but the next morning, on waking, she felt like a queen who, after fearing lest her domain be wrested away from her, sees it firmly insured in her possession.

In context, the "little quiver" on Louisa's face (sentence 22) is best understood to refer to a

a
desperate call for help

b
fleeting moment of emotion

c
full recovery of her life

d
persistent need for Joe's love

e
recognition of righteous hatred