Snipped by me.
For the record, I agree but what I think Cindy is dancing around without actually saying it from experience with my own mother being the 4th child of 5, I sort of get what I think Cindy was hinting at. I think Cindy was very possibly verbally abusive (maybe even physically abusive) and neglectful toward Casey but likely thought money/buying her off would make it okay, and right the wrongs but it can never replace that closeness in a healthy parent/child relationship. It's very common. Also, being that mothers have a special bond with their sons and roles etc. Lee was excused from a lot of what Cindy insist Casey do. Checking in or staying in. Chores. School work... which likely sparked a deep jealousy and rivalry between Casey and Lee. Which is also common when children feel parents choose favorites.
Casey knows how to manipulate. Casey is about Casey. She decided she was going to take the money and run. Which is a shame because again, from experience with my own mother, I really needed her and she let me down time and time again but I could not be bought and I chose to live with my father when I was a young teenager. I was damned if I did and damned if I didn't. I needed my mother but at that time, our relationship was so unhealthy and nonexistent and she was really mentally unstable at the time while I was dealing with trauma's on my own myself, I chose to cut that out of my life as much as possible. It stunted my mental growth in a lot of ways and I had to raise myself while my dad worked days and nights to support us.
The big differences between Casey and I is that I worked hard and learned I had to make something of myself and to make myself proud since I didn't really have parents that stood in my corner to push me or cheer me on. Casey doesn't let anyone close enough to know the real Casey. She also saw everyone in her life as disposable if she couldn't get the desired results out of "relationships" with them, where I mourned the loss of a mother I never really had.
Now since Cindy is a lot like my own mother and my younger sister had it far worse than I or my siblings before me had it, if she was ever truthful and admitted to the neglect or abuse, she would likely have an excuse as my mother does saying she reacted poorly because Casey was a difficult child and she didn't know how else to handle her.