The contrasts between the Prices' home and Mansfield are such that it is no surprise that Fanny thinks wistfully of Mansfield, but there is also a touch of selective memory in her thinking.

Ch.39:
At Mansfield, no sounds of contention, no raised voice, no abrupt bursts, no tread of violence, was ever heard; all proceeded in a regular course of cheerful orderliness; everybody had their due importance; everybody’s feelings were consulted.

Hmm - everybody's feelings except Fanny's, I think. Here's a line from ch.28 when Sir Thomas has invited Henry to breakfast on the day William is to leave Mansfield:-

She had hoped to have William all to herself the last morning. It would have been an unspeakable indulgence. But though her wishes were overthrown, there was no spirit of murmuring within her. On the contrary, she was so totally unused to have her pleasure consulted, or to have anything take place at all in the way she could desire, that she was more disposed to wonder and rejoice in having carried her point so far, than to repine at the counteraction which followed.