save goes to C:\Users\username\Documents\Rockstar Games\Red Dead Redemption 2\Profiles\Profilehash\


Save for those who don't want to play story as Sadie but simply want the save that allows to play as Sadie right on load

make sure to have installed 
Rampage Trainer
https://www.nexusmods.com/reddeadredemption2/mods/233

or 
Lenny's Outfit Changer
https://www.rdr2mods.com/downloads/rdr2/mods/12-rdr-2-outfit-changer/

to load outfit on Sadie because she'll be invisible right on load, save still loads Arthur clothing but because Sadie is a female she won't have these items loaded on her but simply makes her invisible and there's no option to save her clothing yet at least not atm