1 Book Found

Based on your description:

"a book agoes to her place for dinner and the about twins, time frame between 1950-1980? Twins drift apart as one twin suddenly wants to be different from the other. The other twin is sad and confused why. She tries to find new friends. she befriends a lonely girl who's mother is depressed and drinks. The girl (age10-15?) makes them Kraft Dinner. "she pored some ratty looking noodles from a box, then mixed in a orange packet. Soon it gave a delicious cheese aroma". later in the book, the twin that wanted to be different is in a car accident. the other twin can feel her pain./ "