Since you are on amicable terms, can you have a discussion with her on this topic? Tell her what you have said here, that you don't see any movement and you have lost patience. It sounds like you are ready to let go and move on to the next chapter, unless things with her are different from what they seem. But it can be good to check your sense of how things are by direct discussion. It could help clear the air and help make more overt the direction you will take.

Good luck.