What would you do if you fell out with your friend and heard her talking about you behind your back?

Friends value peace. If we fall out, we should actively find ways to solve the contradiction.

I happen to be angry when I hear a friend speak ill of you behind your back, but I think it's because we fell out, so we should be tolerant and explain directly.

If she thinks about friendship, I believe she will solve the contradiction and continue to get better.