I'm interested especially in the parts written in RED
"if ugliness had been a disease or a social evil, she would, counting her blessings, have lent herself to its extirpation"
Its extirpation---whose extirpation????
'Count your blessings instead of your crosses!'.It means be happy for what you have and don't think about the bad things in life. Appreciate the good things you have.
' its extirpation'- the extirpation of ugliness
V. assent; give assent, yield assent, nod assent; acquiesce; agree &c. 23; receive, accept, accede, accord, concur, lend oneself to, consent, coincide, reciprocate, go with; be at one with &c. adj.; go along with, chime in with, strike in with, close in with; echo, enter into one's views, agree in opinion; vote, give one's voice for; recognize; subscribe to, conform to, defer to; say yes to, say ditto, amen to, say aye to...
She would agree, consent to the extirpation of ugliness.