What specific things does Corrie do to keep mentally strong while in solitary confinement at Vught?

Can you include the chapter please?

chapter 12: Vught

This looks like it is in chapter 10. Two nights later guards take Corrie to solitary confinement, where she is prey to her own thoughts and anxieties about her situation. Her new cell contains a cot with bitter cold, rotting straw and a putrid blanket, leaving Corrie to wonder what she did to be separated from the others. Corrie tries her hand at Solitaire and uses her success and failure to determine omens for the real world