Hinata: Hinata is dangerous as she's attacking people's charkra network, cutting them off from their techniques and injurying their organs. This particularly bad for Tsunade and Sakura as their strength is based on their chakra.
- EXCEPT, they have the byakugo seal and mitotic Regenerationn, which negates that. also, based on chakra? tell me who here is not dependant on chakra? Thats absolutely no argument at all, unless if ure trying to prove that hinata > all. Even without chakra amping sakura's punch is still enough to one shot puppets and punch constantly at supersonic+ speeds. Something similar probably goes for tsunade too.
as i said, konan would be a problem for them, but they have the survivability and chakra reserves to compensate until mei takes konan.
why mei takes konan, u ask? first of all any paper that gets in the acid mist will be gone - thats an ultimate defence against konan. and for offense she can shoot water and lava. and on a bigger scale than what konan can do without prep.
how about mei vs the others? it would be harder probably. Hinata, with byakugan and airpalms could disperse the mist around her and if by any chance she gets close to mei, then mei is fked, bcs guess what, mei needs chakra for her abilities and she doesn't have a way to reopen chakra points. Tho that is if hinata gets close before getting hit by other jutsus and hinata cant heal.
Mei vs tsunade or sakura? mei would most likely be taken out by a berserkerous charge, bcs the Regenerationn works as fast as the acid mist. also tsunade and sakura shown to actually use tactics like this. so mei would likely be rushed and punched.
but maybe mei wont fight konan, maybe the fights go with different opponents, why not all of them gang up on, lets say sakura?
you can never know who will attack who for sure, u can only see how well some do vs some others. however, if in characters, then the leaf girls are the least likely to get gang banged, since sakura and tsunade would be the most likely ones to team up, obviously. Also look at sakura's and hinata's relationship - they would never ever fight one another, despite the fandoms putting them against each other until the end of time.
so all in all, tsunade and sakura can compensate for their weaknesses best via byakugo seal.
Tho this fight is in hot springs, so this fight could be totally different....