Yaddle seems to have a higher mastery of the force than Tholme (spending an entire century to amster the force while imprisoned), and seems to know quite a lot of ancient jedi techniques, such as morichro, force light and most likely skills such as battle meditation, force blocking and Malacia. She knew all of these techniques because she was a jedi librarian, and she seems to be more of the historian and dipomat rather than a martial jedi like Tholme.
Now whether any of these ancient jedi skills would give her the edge against Tholme is another matter entirely. If she engages Tholme with her saber, I say it's game over for her, but if something like morichro actually worked against Tholme, and she'd be able to employ it successfully, she most likely has this.
Originally posted by Darth Subjekt
is he a normal sized person or short like Yoda and Yaddle?
Human