This is only my own conjecture, mind.

My lady rarely spoke out her feelings.

For, to begin with, she was of rank: and I have heard her say that people of rank do not talk about their feelings except to their equals, and even to them they conceal them, except upon rare occasions.

Secondly,--and this is my own reflection,--she was an only child and an heiress; and as such was more apt to think than to talk, as all well-brought-up heiresses must be.
I think.

Thirdly, she had long been a widow, without any companion of her own age with whom it would have been natural for her to refer to old associations, past pleasures, or mutual sorrows.