Well, she exists as an off-screen puppeteer in a couple of episodes, but I know what you mean. Having her back in the flesh would have been a nice coda for the series. I guess Natalie was just too busy to come back.I would add that it was a mistake not bringing Moriarty back in some way.
Similar sentiments here too from a slightly different perspective.When the entire series is made available in HD on iTunes at a reasonable price then and only then will I spend my money on buying this wonderful series on a home video format. Other than that, thank you for your review.