In my opinion, (and only my opinion at the present moment, this is subject to change if we see more today,) she did seem upset. Not everyone cries their eyes out when they are under stress and emotional distress. Her nerves to me go hand in hand with someone being under extreme circumstances and that's how some people respond to pressure and upset. For one thing, she'll have been briefed on many of these events beforehand by the police, her lawyer, and maybe even her husband. If she's been manipulated and lied to by him for years then that's a hard pill to swallow and a deep hole to get out of. We have no idea about their relationship or what might have been going on behind closed doors. This isn't someone she met last year who turned out to be a swindler, this is the man she's built both her own and her children's lives with. There are many, many reasons that she might come across as evasive and nervous.
I'm not saying that she had no clue about his schemes, nor that she was completely uninvolved (we don't have enough information about this yet,) but I think we should give people the benefit of the doubt and not start tarring people with a certain brush just because they don't respond in the way that we would or act in a way that we would act. This is her life. This is her children's lives. This is her livelihood. This is her partner of around 5 decades who she's potentially been with since she was 19. There's a huge leap between living under a rock and choosing to believe things that made your life easier at the time and not caring about the case or anything that's going on.
This isn't just directed at you because I think you had good intentions with this post, but I think we should all be a bit kinder to each other and wait for more info before making snap judgments on someone's character.