When Mama says she doesn't tell these stories for spite (lines 72-74), she means she
(1) doesn't want to return Jenny's and
Sigrid's unkindness
(2)
wants to entertain her listeners with interesting stories
(3)
doesn't want Trina to overhear the conversation
(4)
doesn't want Arne to know the details of these secrets
(5)
wants Jenny and Sigrid to approve of the marriage