"Fading off into the obscurity of life in prison" is precisely what is going to happen to her. This is the case to some extent even if she gets the death penalty: execution takes a while and sometimes does not even happen. Why wouldn't she get some attention when she can? Her life is basically over and she might as well enjoy the few things she may be able to get. Have you thought that even being dressed in regular clothes is such a rare treat for someone who will spend the rest of her life in a prison uniform? The days when she wore regular clothes in court may be the last few times she got to do that, and she must have known it. For someone who has nothing to look forward to, even something like this, or the lousy "outing" to court, looks desirable, even just to break the routine.