Well - we don't like to do people's homework for them, but it sounds like you actually have read the books, so here goes:
LWW, Penguin Books, 1959, p. 75:
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'But shall we see him?' asked Susan.
'Why, daughter of Eve, that's what I brought you here for. I'm to lead you where you shall meet him,' said Mr Beaver.
'Is - is he a man?' asked Lucy.
'Aslan a man!' said Mr Beaver sternly. 'Certainly not. I tell you he is the King of the wood and the son of the great Emperor-beyond-the-sea. Don't you know who is the King of Beasts? Aslan is a lion - the Lion, the great Lion.'
'Ooh!' said Susan, 'I'd thought he was a man. Is he - quite safe? I shall feel rather nervous about meeting a lion.'
'THat you will, dearie, and no mistake,' said Mrs Beaver; 'if there's anyone who can appear before Aslan without their knees knocking, they're either braver than most or else just silly.'
'Then he isn't safe?' said Lucy.
'Safe?' said Mr Beaver;'don't you hear what Mrs Beaver tells you? Who said anything about safe? 'Course he isn't safe. But he's good. He's the King, I tell you.'
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The only girl being struck by Aslan that I can recall is Aravis in The Horse and His Boy. Is that the one you mean?