I am going to bump this over to Nirvana for you - although to be fair these ponies are a little bit of a grey area for some, they fit a little better there.
And as others have said, yes she is a German exclusive release. In her set along with Raindrop, Skydancer [alt pose], Starshine [alt pose] and Moonstone & Flutterbye. It was essentially a German "Rainbow" set - as the set name of Regenbogen suggests.