>>6411460(Excluding Disney Parks for this)
So the earliest I've been able to find Disney Store exclusive dolls is 1999, pic related. Many of them were created just for UK Disney Stores in these first years before the launch of the Princess line.
They started releasing the "Princess" dolls in 2001 when they quietly launched the line, and at this time the Princess dolls include Tinkerbell, Alice and Esmeralda. From 2001-2005 they were releasing both the "classic" looks and special dolls, like ballerina, winter, etc The quality had really degraded by 2008 for the classic dolls, which were now stuffed into tubes. 2009 is when they revamped the dolls because of Snow White's anniversary and started a handful of golden years where DS was producing really gorgeous exclusive dolls. Remember the 2010 "&friends" dolls, with the gorgeous dresses? I think that was the last time Mulan had actual layers in her clothing and wasn't coated in glitter.