Risha story isn't long tbh she only shows up during parts of the story, as you walk around during the beginning she shows up while the game show different characters that you can interact with and at the workout area at 22:00 tbh she doesn't have story yet from what i've played so far she's just around while you progress the main storyline
the greenhouse is restricted no matter what, so no matter what your reputation is with them they'll still fight you if you're in there and they spot you/on the same tile just they might surrender more often with higher rep but not by a lot