No. They kept her around like she wasn’t someone who should be imprisoned for life, far removed from any position where she could manipulate others.

Which is a different complaint. Your initial problem was saying it was "based around her." This isn't. She's a side character. But let us address your complaint then, shall we? She commited no crimes in Federation space. None. Not a single one. She was brought, against her will, from the place she was from into the Prime universe. What you're asking for is to hold her guilty under Federation law when no crimes were ever committed in Federation space or against Federations persons. In fact, she actively helped Starfleet in multiple occasions. When she arrived in the Prime Universe she was imprisoned and while having issues with that, she didn't fight back. She understood the situation that she was in a new world with new rules. The Federation doesn't imprison people for doing things in their own space, nevermind when it's a different universe altogether.

If they wanted to help others, there was a universe full of people more deserving. Two, even.

Both are capable as were proven throughout Season 1, 2 and 3.

Yep.

Then nothing you say can be taken seriously if you are willing to outright ignore, and admit you're ignoring, things that don't fit into your invented narrative.

Have fun with that. I've got far better things to do with my time than engage with arguments made with such bad faith and dripping with such bitterness.