#2. Sunny
Whilst many of the WWE stars on this list have made the decision to never return based on their experience whilst contracted with the company, it appears that Sunny would be one female wrestler that the company won't be inviting back anytime soon.
Sunny has had her own issues outside of the company and has had a number of run-ins with the law. Whilst WWE has tried to help the former star a number of times and even paid for her rehab to help to get her on track, that didn't seem to have helped Sunny land on her feet.
The former star makes headlines on a regular basis for all of the wrong reasons and given that WWE puts a lot of emphasis on their presence online, she wouldn't be the kind of star that the company would invite back in the future.
Sunny is already a WWE Hall of Famer and has been thanked for her contributions to the company so it's believed that her chapter with the company is over, so there is no reason to ever bring her back.