CA might imagine she can kill two birds with one stone. Of course it's always been important for her to insist ICA was an innocent Mother of the Year - ICA is an extension of and reflection of CA's narcissistic-little-self, imo.
And I don't think for a second that CA is happy with GA, who squandered family money on his vices, made her work even harder taking care of the family and her granddaughter in the process, stole the public sympathy (ie: attention from her) with the suicide attempt and humiliated her with the RC scandal. I don't think GA squandered as much money as CA would have her family believe. I would not be surprised if this was a coverup for KC taking a lot of this money. No job for over two years so who paid for gas, clothes, personal items, movies, etc.? And let's not forget that GA received a considerable some from WComp. as a settlement and he did appear to be working. As far as RC it would not surprise me if CA was behind the whole thing. Where did that money go? There is no paper trail but somehow the A's had money to spend even though the both were not working during this timeframe. CA has no room to feel humiliated about RC when you listen to testimonies given about she and DC. I don't think they have had a real marriage for a long time and now they just support each other trying to get through this.
So if WFTV and others are right about the defense having GA in their crosshairs, I would imagine CA might "corroborate" anything necessary for her daughter that could put GA in a less than flattering light, and dispatch the support obligation of their symbiotic relationship, in addition to punishing GA once and for all for all his sins, real and imagined. After all, it's not like she hasn't even admitted the fact she has either considered or actually been uncooperative with physical evidence (the FBI and the toothbrush/hairbrush incidents for just one example). We've seen all the lies she has told over the life of this to the media or in a depo (including my favorite, insisting in court she thinks Caylee is alive after executing a flashy public memorial and sporting cremains jewelry as if she thinks, like ICA, that the lies she tells one minute evaporate and the morons in the public will never bother to cross reference them to new ones).
And well, whatever her role, I'm betting she's bucking for something way bigger than a "cameo". She needs to get even with both her daughter and GA and what better way than to go down like a self-immolated martyr "supporting" her daughter by agreeing with whatever she may say...