How has Molly changed since the boys last seen her?

After a nearly fatal brush with Scarlet Fever, Molly returns to the Peaceful house, but she has changed. She now has the beauty of a young woman, and Thomas and Charlie both love her more than ever. Molly and Charlie form a relationship after they leave school, and therefore Thomas, behind them. She still loves Thomas, but not in quite the same way as Charlie. She doesn't want to tell Thomas about Charlie because she doesn't want to hurt him. After seeing Charlie in secret for a while, she becomes pregnant with his child. Molly's parents throw her out of the house for being a sinful girl, and she goes to live with the Peacefuls, who accept her as a full time part of the family now.