I don't believe for one minute what the th's are saying, that Casey is possibly insisting to take the stand, I think the mental evaluations were a last ditch effort to get a mistrial because they know she cannot take the stand and they have no way possible to prove their theory. She may try to but I highly doubt it. She has been an over indulged enabled spoiled selfish brat, but I don't think she will try to take on the prosecution.
AF is still shooting for a mistrial with her motion, don't think that is anymore than another waste of time.
If Casey ever cared about anyone in her life I believe it was Lee, possibly she shut down any more torture of him and they threw up their hands, her emotion for him was real.. can you imagine her on the stand having to outright accuse him?