If Casey were the normal person, and not the sociopath that I believe she is, I would agree with you, whole-heartedly. Casey, IMO, will not question anyone's loyalty because she doesn't care about loyalty, she cares about Casey and what's in it for her. You can bet there's a guy out there, probably more than one, who sees with his nether parts and will make her feel like she's still a hot body hottie. He'll let her borrow his F-150 and his Target credit card and she'll tell him stories about how she was wronged by everyone she ever met - how the death of her child effected HER. Poor blinky Casey.
If you've ever known a Casey, you know what I mean. They just move on and never look back except to use those they left in their dust to dramatize a "poor me" story. You figure them out and they just move on, you can't stop their crazy train.
An innocent, normal person accused of this horrible deed, followed by being judged as the most hated person in America, would have probably tried to kill themselves by now. At the very least they'd have been put on suicide watch at some point during their incarceration. Hell, even guilty mothers who have actually killed their kids were put on suicide watch - Andrea Yates, Susan Smith.... Not Casey - she loves herself far too much and firmly believes it's just a matter of time before she's living (in a Jersey Shores kind of way), large again.
Were she normal...I'd find hope and solace in all your points....but I find it a stretch that Casey will be that bothered.