Because I found it in a second hand store for three dollars, and it said "Prada" right on there, and I knew it was an expensive brand. So Maybe i coulda sold it or something.
the op thought she got a good buy, and three cheers to that! way to keep your eyes open!
But, yes, it is fake. Im sorry.
Trying to sell it at this point, knowing it is fake, would get you into trouble.