Gosh, I would have said she was one of the easier ponies to track down of the set. But then again I think its all about timing - sometimes even the most common ponies just vanish from sales threads around the same time making them hard to find and other times 3 or 4 of a sought after pony pop up on ebay in the same week.
I spent a long time looking for a Flower Bouquet once and found her harder to find than Diamond Dreams - which I know was just my perspective but it sure felt like she was as rare as Rapunzel!
If you dont get one from people in this thread, you could try an advert in your siggy promoting that you are looking for her. I am sure she will turn up quickly enough for you.