I would not be surprised if WWE have tried to get Gail Kim back. Heck, this could even be a work! She retires from Impact only to show up at WWE a month or so later! Still, I do agree, she's been one of the consistently better women wrestlers of the last decade and a half, so I think she does deserve to retire before injuries force her out...
4CW Hall of Fame Class of 2018. Triple Crown Champion 2020. 2 times Universal, 2 times Tag team and 1 Time World Heavyweight Champion.
Wrestler of the Year 2017, Champion of the Year 2017, Most Improved 2017
If she goes to WWE, it'd probably only be as Performance Centre coach.

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She's had some serious injuries hasn't she? Can't blame her for retiring as you gotta look after your health. She could probably be a good coach. Some of the women in WWE need it, so get her in when she retires, I say. Help them out. Then again, I'm sure they're thinking the same at Impact Wrestling with themselves.

She rejoined TNA in 2011, but she was a prominent member of the roster before that. Being the first Knockouts Champion and putting the division on the map.
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It's not an immenent retirement, but she's announced that she will definitely be retiring this year.
One piece of news related to this was that her career only began 2 years before joining WWE. I thought she was a wrestler for a long time before then. Not sure why, but I always did.
She's always been pretty good when I've seen her wrestle though. Definitely one of the better women wrestlers in recent memory and one that I wouldn't have minded coming back to WWE.