Which Fruits Basket chapter is this in?

I remember it had Tohru as a toddler holding a mirror and looking at herself...i think she was crying and she was in her dads room (it showed his suit on the wall). It talked about why Tohru is so cheerful and shows her smiling with her mom. She's says like 'even if it seems stupid to others...I must keep up that look' or something like that. can you please help? Even telling me which volume would help alot! Thanks! :)

Which Fruits Basket chapter is this in?
I think it was in the 18....



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