Most of the success stories have a common theme. The lbs has utterly and truly let go of their ex and is getting on with their life.
Your ex knows you are still keen and whilever she knows that it's likely she wont be interested.
Perhaps try cutting down the interaction and friendliness. Perhaps go on a few dates.
You can't fake it with the person that knows you best in the world - somehow you have to really not want your ex back for her to be interested. No idea how to do it but that's my current thinking.
That said i'm doing an appalling job of achieving that.
