Interesting thing about most real-world myth: it has no canon. People just made up words and creatures without much rhyme or reason or care for what might have gone before or what some scholar somewhere decided to put into writing. I mean, none of these things really existed, so it's not like someone go check. "Guys, no, this is a brownie, and this is a booka, and this is a dobie, and this is a goblin, and this is a domovoi, and they are all totally different things, because look, they are not the same!"
"Are the svartalfar the same thing as the dvergar?!" is kind of the wrong question to ask.
And either way, dwarves in D&D have often been described as brown-skinned, and have only occasionally been depicted that way. And this one isn't. But maybe this one's a Mountain Dwarf, or just a light-skinned Hill Dwarf or something. It ain't like she's blue, she's consistent with the descriptions.
But I'd be into more brown dwarves, totally.