Another chapter of the enemy to ally series, enjoy!
This is a patch that is part of a new series of mods called Enemy 2 Ally or E2A by nazarethblood. This patch disables the original follower placement so you won't be able to find them waiting in an inn, for instance. Instead, an enemy version of the follower has been placed out in the world for you to find and defeat. On the body of the enemy version you will find a teleportation tome which will allow you to summon the now enabled original follower and you can invite them to join you as normal. This mechanic is useful as it allows E2A followers to be found out in the world in an organic fashion and because each follower has three random places where they can spawn, every playthrough will be different even if you take the same exact route.
This is the E2A patch for Julie. The original follower mod is still required. You can find it on the Nexus. Please choose "CBBE" and "Follower" options from the FOMOD. There are two versions available. The one labeled original uses the provided skin textures and body while the one labeled de-standalone uses your installed (default) skin textures and body.
https://www.nexusmods.com/skyrimspecialedition/mods/113596