How do Maggie's scars affect her life in "Everyday Use" by Alice Walker?

Maggie's scars cause her to turn inward in life.
After having been so badly burnt that she "stands hopelessly in corners," it becomes apparent that Maggie feels inferior to her sister and looks at her with a "mixture of envy and awe." Like a lame animal, Maggie sidles when she walks and lowers her head with downcast eyes. 
Because Maggie feels inferior and is unworldly and timid, she stays at home. And, as a result of this intimidated nature, Maggie turns her interest to things of the family, respecting them and learning their history. So, when Dee asks about such things as the butter churn, Maggie corrects her sister when she says that Uncle Buddy whittled the dash to this churn, telling Dee it was their Uncle Henry, called Stash by the family, who actually did the whittling.Unlike Dee, Maggie treasures things made by family members. Later in the day when Dee goes into the bedroom, she selfishly grabs the quilts sewn by hand by Grandma. However, the mother informs her daughter that she has already promised these quilts to Maggie. Angered at not getting her way, Dee complains,

"Maggie can't appreciate these quilts!....She'd probably be backward enough to put them to everyday use."
"I reckon she would....God knows I been saving 'em for long enough with nobody using 'em. I hope she will!"

The mother replies in this manner, remembering how some years ago she offered Dee quilts to take to college, but Dee refused them. Then, the submissive Maggie comes from the kitchen, with her feet scraping over each other. "She can have them, Mama," she says.
Overwhelmed by this submissiveness and humility of Maggie, the mother feels that something has hit her "like when I'm in church and the spirit of God touches me...." She hugs Maggie, then drags her into the room, and grabs the quilts away from "Miss Wangero's" hands, dumping the quilts into the lap of Maggie, who sits on the bed in amazement. 
This assertion of the mother of her love for Maggie causes the daughter to smile--"a real smile, not scared" or inward. After Dee departs, the mother and Maggie sit together enjoying their dips of snuff until darkness falls and they must return to the house.