Dall took an interest in fellow female Transcendentalist Margaret Fuller and attended her "Conversations" in Boston in 1841. She found the older woman "more agreeable — modest — than I anticipated." Dall later wrote a biography of Fuller. Some suggested Dall had picked up where Fuller left off but, in her modesty, Dall disagreed. "How unfit I am to be named with Margaret," she wrote, "but it was pleasant to find one person, inclined to throw her mantle over me — and it brought a tear of strong resolve to my cheek."
On June 3, 1841, Miss Healey (she did not marry Charles Henry Appleton Dall until 1844) wrote in her journal about Essays by Ralph Waldo Emerson (she had seen him speak as early as when she was 12 years old). She noted her impression:
That on Compensation is the finest thing upon the subject... but the views advanced in that upon self reliance — are extravagant and unsafe. When I read the essay upon Friendship, I was moved to find a man — who had gone through the world — feeling — like a girl — under the first development of her passions — for there is a time when friendship is a passion.
Dall noted that she had not yet read the essay "Love," but noted its first sentence — "Each soul is a celestial Venus to every other soul" — as "peculiar." A male friend of hers noted that "if Mr Emerson had ever seen his soul" he would not have written that.