I still wouldn't ride her - besides, I strongly doubt that horses are able to fake being sore. Firstly, they have no reason to and secondly, I really don't think they have the cognitive skills to do so. Just give her some more time, I know its hard to wait but waiting really is the best thing. Why don't you try lunging her, just to see what she does?
When I bestride him, I soar, I am a hawk: he trots the air; the earth sings when he touches it; the basest horn of his hoof is more musical than the pipe of Hermes. ~William Shakespeare