You’re supposed to have a jury of your PEERS, people who know you and have known you for a long time. In other words, knowledge of character plays into the verdict.
She may have been sincere in thinking she could be unbiased, but when she got home her husband threatened to leave her if she voted one way or the other, or something like that. Many people would have a hard time overcoming that.
These individuals do not necessarily share traits similar to a defendant’s. As such, there is no guarantee that those who hear a defendant’s case will be of a similar age, race, socio-economic background, or gender as the defendant, though these traits alone cannot disqualify someone from serving as a juror.
I guess being rich isn’t part of a jury of your peers.