Kirsten, I sure hope the vet can help Luna NOT get these problems all the time. I feel that there HAS to be an answer somewhere.

As for this....
Feeding an extra diet would also mean I would have to feed Luna and Lily seperated from each other forever. And this would be hardly possible because Lily never eats her food at once
She WOULD learn! So if you really wanted to try feeding separately, the cats would adjust and it should take under 5 days and I bet they'd eat at their set time.