Boaz--Shae was not a spy. I remember someone posted this before so I went searching. Thats where Ive been the last week, it turns out the servers for this site are on a small plateau deep in the Himalayas....I nicknamed my sherpas Boaz and TK. Anyhow I went digging and it turns out you posted the Shae was a spy idea earlier in a thread of my very own.
Everyone needs a conspiracy theory
The most telling piece of evidence is Sansas chapter where Shae (impersonating a handmaiden) is insolent with Sansa. Now Sansa assumes Shae is not a very good maid but the reader assumes its because Shae would like to be Sansa (maybe not neccessarily jealous of her husband but her position). With Sansa married to Tyrion Shae has no chance of being installed as a lady which is consistent with her expressed desires to Tyrion when she speaks of Joffreys wedding (and oddly his funeral) feast.
Im going to cut this short, I need to feed my llamas