How has Estella's attitude changed?

Over time, Estella has learned how it feels to be hurt..... and she has learned what it means to care.

"But you said to me," returned Estella, very earnestly, 'God bless you, God forgive you!' And if you could say that to me then, you will not hesitate to say that to me now - now, when suffering has been stronger than all other teaching, and has taught me to understand what your heart used to be. I have been bent and broken, but - I hope - into a better shape. Be as considerate and good to me as you were, and tell me we are friends."