At first I thought she was a halfling until the dungeon carpenter halfling showed that there are actual halflings in the setting and she's not one. Then I thought she was a dwarf but she's not that either now that there's an actual dwarf.Wait what? Rudy ISN'T a dwarf? I was totally convinced she was.
Maybe she's just short with actual clinical dwarfism? There's still the possibility she's a gnome, which would fit the amazing but impractical inventions, but then there'll probably be a gnome side character chapter and she'll be surprised to see one.