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????
' 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.