As I was feeling sad for Anne too, I was also noticing how she tried so hard to give herself some courage or pep talks or steel her own nerves, in the total absence of anything like a confidante or friend.

There are some statements which seem to be in the narrator's voice which actually, I think, are Anne trying to shore up her own feelings:

Ch. 5
"Anne, though dreading the possible heats of September in all the white glare of Bath, and grieving to forego all the influence so sweet and so sad of the autumnal months in the country, did not think that, every thing considered, she wished to remain. It would be most right, and most wise, and, therefore, must involve least suffering, to go with the others. (to Bath, before Mary's 'invitation'"

Ch. 7

" what was it to her, if Frederick Wentworth were only half a mile distant, making himself agreeable to others?"