I took a look at your site. There is actually alot of things going on here. First of all, Google is not indexing your meta description tag and that is perfectly ordinary. Reason being, the meta title tag is below it and the bot looks for that first, so it never comes back to the meta description tag meaning it ignores it. From an
SEO perspective also, just FYI, the meta description tag could actually benefit from some more textual optimization. But if you will move the meta title tag to above the desorption tag and just below the opening <head>, that will help. But you will need a more relevant meta description tag meaning more content to give it enough juice for Google to want to make it the "relevant" description of the site and/or page so add another sentence or two.
The reason(s) you have fallen in the search engine ranking position (serp) in my opinion is because of (but not limited to as I think there may be a few other reasons such as perhaps the site has been recently moved or redesigned?):
You have been caught by the ever changing Google algorithmic "shuffle" which has recently tightened considerably with respect to content that is getting top placement.
For one, you are being seen (in my professional
seo opinion) as rather spammy on your first page with respect to the search term "hair extension." Granted I didn't perform my customary mathematical and precise analysis and this is just an eyeball look but looks spammy to me professionally speaking so probably looks spammy to google to now with its new system. In fact, if I was an editor looking at the site manually I would think it is spamming the search engine altogether in the way its content is written. But that is just my opinion.
And I am only looking at the front page (the most important one), so remains to be seen if this is carried across sitewide, although probably if the front page is any indication.
So my advice if you were my client for what its worth would be to rewrite the page(s), make it friendlier for as if I was an actual customer, strategically input my search terms where they need to be and no more and work backwards (or forwards as the case may be) from there.