Yes, she did. And I remembered back to the Scott Peterson case and how an expert said that Scott (and sociopaths in general) could not empathize with emotions the way normal people do. Because sociopaths are detached from feeling, they will use words they believe emulate the response they are supposed to have in a certain situation, hence using a lot of quotes from other sources to piece together "their opinions".
Trust no one, - Casey telling Cindy she feels betrayed, but no more.
Only yourself.
With great power, - Casey's perception of Cindy's power over her, and how she'll pay for it
Comes great consequence. - Casey changes the Spiderman line to fit her message of "You will pay mom."
What is given, - i.e Casey "gave" Cindy a granddaughter.
Can be taken away. - i.e. Casey telling Cindy she's the one being punished.
Everyone lies. - Probably Casey telling Cindy she's the liar for 'turning' on her.
Everyone dies. - Casey implying what has been done, though at this point she thinks she's being slick about it.
Life will never be easy. - Casey will be hidden if she can find a guy to take her away, and Cindy will never see either Casey or Caylee again.
On the worst of worst days, - Song lyrics used to dramatically tell Cindy to 'listen up, because I get the last word here'.
Remember the words spoken.
Hold your head high. - i.e. Casey telling Cindy she has no regrets and is not afraid.
Smile. - i.e. Casey's already over it. Over it all, and has wiped her memory of care.
Laugh. - i.e. because Casey's life is her own now, nothing Cindy has 'done' to her has any remaining effect.
Love unconditionally. - i.e. Because Casey perceives that Cindy has not after yelling at her for stealing.
Tomorrow is a brand new day." - i.e. Casey is on to new and better things. Cindy lost her chance to be a part of Casey's life, and it's her loss.