This is a patch which allows Flora to join earlier in both Fire Emblem Fates: Conquest and Revelation--the end of Chapter 8 in Conquest, and Chapter 12 in Revelation. It's highly recommended though not required that you use my Gay Fates hack to allow her support conversations with other characters. This is primarily for players who want Flora for story/character reasons.
Unfortunately, the early join in Conquest only works if you have a Conquest or Special Edition cartridge/download and the Revelation early join only works if you have a Special Edition cartridge/download.
This patch comes with my Corrinsexual Rebalancing Patch built in, as Flora doesn't really work without it. Unlike that patch, however, Flora acts like Felicia and Jakob--she has a level cap at 40 and levels at the same rate. It also removes her natural access to mercenary, though you can easily A+ her with Felicia or Soleil using my gay Fates hack to regain access.
Download here.