If I were in a similar situation, I would probably just continue to monitor her but leave her wild. Turtles have a truly marvelius capacity to reover from such injuries. My personal feeling about not releasing injured turtles is that it really depends on the severity of the injury...many wild turtles survive trauma and continue to live for years. Do not underestimate her chances of survival.
Another option would be to overwinter her indoors and release her, in the same place where you found her, next summer. Releasing her elsewhere is a bad idea.

Here is a link to an article that may be of interest to you.
Link

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