Yes.
In the first clause, "so" is important. There are many motives which drive a woman to contemplate in this way.
In the second, "nothing more exalted than" is important. Anna's motive was miniscule : a sister-in-law was always there.
Edit. Wow! My Am. Htg. doesn't list "miniscule." It seems the original spelling is "minuscule."
Note that "exaulted" is used somewhat sarcastically here.