In The Chrysalids, the Sealand woman refers to herself as being the "superior variant." What incidents are there in the book that show her arrogance?

I remember studying this book in school myself and
thinking that this woman was very arrogant. You might want to analyse the series of
sermons that she gives the children regarding evolution and how she views the Waknukians
compared to the new form of human that her kidn represents. She gives a series of
sermon-like speeches to the children that clearly identifies her own world-view and the
position of dominance that she feels her people to occupy. Consider the following
example:

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Whether harsh intolerance and bitter rectitude
are the armour worn over fear and disappointment, or whether they are the festival-dress
of the sadist, they cover an enemy of the life-force. The difference in kind can be
bridged only by self-sacrifice: his self-sacrifice, for yours would bridge nothing. So,
there is the severance. We have a new world to conquer: they have only a lost cause to
lose.

It is perhaps ironic
that for all the talk the Sealand woman gives about the necessity of the Waknukians and
"old" humanity dying so that the "new" humanity can thrive and live, she ignores the
implications of her own teaching. If humanity is a species that evolves like every other
creature, then the telepathic stage of humanity that she represents is just another one
of those stages. She is displaying the kind of arrogance that finds its parallel with
David's father in identifying a perfect form and treating any deviation from that form
as a mutation to be stamped out and obliterated.