Quote 4
The Witch was just turning away with a look of fierce joy on her face when she stopped and said,
"But how do I know this promise will be kept?"
"Wow!" roared Aslan half rising from his throne; and his great mouth opened wider and wider and the roar grew louder and louder, and the Witch, after staring for a moment with her lips wide apart, picked up her skirts and fairly ran for her life. (13.54-56)
Because the White Witch is herself a treacherous creature, she assumes that Aslan will try to trick her if he can. Of course, we know he would never do anything like that – and he doesn't. It's not in his nature.
Quote 5
"Tell you?" said the Witch, her voice growing suddenly shriller. "Tell you what is written on that very Table of Stone which stands beside us? Tell you what is written in letters deep as a spear is long on the trunk of the World Ash Tree? Tell you what is engraved on the sceptre of the Emperor-Beyond-the-Sea? You at least know the magic which the Emperor put into Narnia at the very beginning. You know that every traitor belongs to me as my lawful prey and that for every treachery I have a right to a kill." (13.41)
Narnia isn't all beautiful landscapes and feel-good romps with Aslan. There are painful requirements in the spiritual laws of this world, and the country itself could be destroyed if Aslan didn't abide by those rules.
Quote 6
"It is a lovely place, my house," said the Queen. "I am sure you would like it. There are whole rooms full of Turkish Delight, and what's more, I have no children of my own. I want a nice boy whom I could bring up as a Prince and who would be King of Narnia when I am gone." (4.26)
The Witch's barrenness – her inability to generate her own offspring and become a mother – is part of her evil. She is not a functioning element in a family group, but a dangerous outlier.