Okay thanks for telling me about Dan giving her chakra. Sorry I was wrong.
Tsunade did it coz she recived chakra from Dan otherwise where as other kages were exhausted even when Madara trolled EDO tensei.That's it.
Katsuyu can protect her too. Tsunade got 2 ways of tanking.Either of Mei's KKG can easily melt her organs which'll force her to use regeneration.
While Katsuyu is tanking, she can use her acid to occupy Mei.
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