Hi Hayley
I can see 12
http://www.google.com/search?q=CollierLewisJewelry++etsy&tbm=shop&hl=en&aq=f Keep an eye on it and if it doesn't get any better in the next few days deactivate and reactivate the missing listings. Some people have had issues with missing listings recently, Google also ignores listings it thinks are duplicates and throws out some with certain words in e.g. free.
As it is such an underused resource at the moment I wouldn't stress about it too much.
If you are amending your titles and tags for relevancy as per Etsy suggestions you are part there for SEO. E.g. Etsy tags are meta tags/key words in the html code, if your keywords are in the first 70sih characters you are good for urls and therefore SEO.
However complicated it might seen a lot of it is just common sense and a lot of people have always been doing the right thing, or nearly all of it, without realising it.
Claire
Team Leader