She pulls the phone away from her ear because the sound was too high. She asks them to turn it down, and then when it is at a comfortable tone, she makes the don't worry statement, which appears completely out of step with what her mother said. It is an inappropiate response. Nevertheless, CA is relieved that Casey heard her because it was an important statement and she wanted her daughter to hear it. She imo was told that Casey was afraid her mom wouldn't forgive her, so she was attempting to reassure her. It appears to me that they are uncomfortable talking love and forgiveness, or anything deep, or heartfelt. CA is rocking, nervous until she says that, and then she appears more relaxed, but I think it's because she needed to get it said and heard.
The full statement is important and it is, "We forgive anything you have said, or done." She just wants her granddaughter back, and Casey responds with spin, imo.
the conversation continues with Casey blowing off all that CA is attempting to gather as far as information. CA is clearly the docile one in that relationship, though most think CA is the ruler of the roost. It's clear to me that Casey is the one in control in that family.
CA clearly loves her daughter, and her granddaughter, and is extremely concerned for Caylee in this visit. She is also concerned for her daughter, and her heart breaks when her daughter cries. jmo