There won't be any long term secrets between L/T and the rest of the team. With Constantine coming in 3x05, Laurel/Thea must come back towards the end of 3x04. Laurel explains what she has done, Oliver gets pissed, Laurel asks/wishses for some kind of solution, Oliver opens up his rolodex and suddenly remembers his supernatural friend that he placed in the mystic section that he keeps skipping over.