Chess.com Keeps unfairly banning my friend


Chess.doesn't discuss its reason for banning in the forum.
However, you can read about how it has had its methods validated by Grandmasters and statisticians.
https://www.chess.com/article/view/online-chess-cheating
Appeals are reviewed by real humans.
If your friend keeps having accounts closed for cheating, it is because she is cheating.
Join the Cheating Forum club to read and discuss further.