"Kdo je ta vysoká holka?"

Translation: Who is that tall girl?

[topperharl12]

What's wrong with "that big girl"? Does "vysoka" explicitely reference to body height? In that case, one could see "big" as too unspecific...

[JanLyko]

Exactly, "vysoký" means exclusively body/mountain/tree height.

"Big" serving as euphemism for "fat" you can translate as "silný / silná" (literally "strong").

[kacenka9]

yes, vysoká is height only.