She will be well into her police pension now, they couldn't take it off her (I doubt they could back then). She has had plenty of time to put right a wrong, like being part of a conspiracy to send an innocent man to prison. Instead when chose to speak out, it was to admit she was wrong about the rifle in the window.
Where / when did she do that? I must have missed that.
BTW, not every person is knowingly or willingly part of a conspiracy. Some may be passive or even unknowing.
For example, if a police officer raised something with their superior, like a serious concern for example, that raising of the issue internally might be enough to salve their own conscience. They did what was right. They raised their concern through the correct channel.
The fact that their concern didn't go anywhere, is not on their own conscience. It's now the fault of a higher up person who chose not to act on it. Not everyone is like a dog with a bone.