great expectation queston

although quite a few parts are confusing in the book one that sticks out recently in my head is when pip went back for Mrs. Joe's funeral and when he went for a walk and talked with biddy. the quote is on page 306 in the attic book at the end of chapter 35 "... I reflected what an unkidness, what injury, what an injustice Biddy had done me." My question is what was the injustice that she had done to pip. I was confused about this because pip hadnt seen Biddy in awhile and how had she did something to him.