It is being sent away forever not to return to Middle Earth. Ever. What part of that do you not agree with?
What flaws did they actually support with the writing of the show? You keep saying this but these flaws aren't actually shown and it is a complete contradiction. If she is a badass that isn't a flaw. If she is right about Sauron, that isn't a flaw either. So what flaws are you talking about?
They showed that as them getting rid of her for being a pest in the dialog that takes place after. It isn't a reward and this is why she swims away towards Halbrand. The show itself is not showing it as a reward because if it was she wouldn't be shown swimming away from it. It completely shows that she is dedicated to her duty to the point that she would turn away from eternal rest and peace to go back and fight Sauron. Which she shouldn't have to do because the Elves should already be believing and trusting her insight. That is the contradiction. All of that was totally and completely unnecessary.
No it is not a reflection of anything in Tolkien because when she was exiled from Valinor she wanted to rule her own kingdoms and none of the Elves stopped her from doing that. They did not disrespect her or second guess her judgement. When she said that she sensed Sauron stirring, they didn't second guess her, try to send her to Valinor or send her on a quest to prove it either. They simply acted on it because she was one of the oldest, most wisest and respected of the Noldor. This series in no way shape or form reflects any of that.