Good luck with this batch, you will have to paint a little red 'L' on her nest. Rockie parents take a while to get the hang of things don't they. Lovely pictures.
We have a mad blackbird that keeps ripping up all the plants to build nests, she and her partner have twice adopted an earlier nest sat for a bit then gone off to feed. They sit nicely for a few days then seem to get bored. They will learn maybe they are first time parents too, I expect they will do better next season.