I think they're going to try and say she genuinely believes all her lies are truth when she says them. The assaults, the pregnancies, the break-ins, the Gannon being out to get her, the rapes, the abductions... all of it. That she's out of touch with reality and that Gannon's death was sadly inevitable because AS dismissed her as a fantasist and liar rather than a well meaning and goodhearted stepmother who was, though no fault of her own, seriously mentally ill and psychotic. They're going to pressure him as to why he didn't get such a clearly sick woman the 'help' she needed, and why did he leave his vulnerable children with her. They're going to blame him and try to paint her as a victim. It's going to be ugly.
MOO