According to Mama, how is Dee different from her and from Maggie?

Mama notes that Maggie is "homely," and black Dee is lighter, "with nicer hair and a fuller figure." Dee is outgoing while Maggie is shy and withdrawn. Maggie regards looks at Dee with "envy and awe,"Dee has forged her own way in life while Maggie is relegated to a life that is similar to Mama's. Dee wants fancy things: there is a superficial quality to Dee while Maggie is practical and content with living in the poverty that she has always lived in.