Sentence:  Gerty MacDowell bent down her head and <WSD>crimsoned</WSD> at the idea of Cissy saying an unladylike thing like that out loud she'd be ashamed of her life to say, flushing a deep rosy red, and Edy Boardman said she was sure the gentleman opposite heard what she said. But not a pin cared Ciss. 
Meaning of the word marked with <WSD> tags:  To become crimson or deep red; to blush.