The mistake your making(as is the queen) is the belief that ruling with a iron fist(aka fear and not respect) is the only way. Queens can also rule where the people love her. Some criminals can be reformed and some are rotten to the core and cannot be reformed. The kidnapper if she repents of her ways can be a productive citizen of Zeta if given the chance. As of now she has yet to be self-aware that she has done anything wrong(I believe in discipline however to correct this wrong kind of thinking) and if you treat her like shit it's all she will know. Show her the better way.
The medieval or ancient penal system did not deal with rehabilitation. The aim was to punish the convict spectacularly. On the one hand, to deter people from committing crimes* and, on the other, to provide entertainment for the mob. (Panem et circenses, but there was no TV/Internet.)
*Yes, deterrence doesn't work. People who steal do it because they think it's okay. And it never even occurs to them that they might get caught.
Kidnapping the stalker's daughter is a double crime.
Against public safety: it reflects badly on the queen when someone's daughter is kidnapped in broad daylight in her city.
Private: Ain belongs to the stalker.
The Queen will be able to say: OK, your punishment for your crime against me is done. From here I'll hand you over to the stalker to do with as he pleases.
I don't know the laws of the game world. The developer will decide.