Well, in the game she will have different weapons, and depending on what weapon she will either throw it (pinwheel/rising star/etc) or run up and swing it (like a sword or club).
And then of course, Yuffie is a thief-type, so she is able to steal too.
But in VII everything is based on materia, so anyone can really do anything, heh.
There are her Limit Breaks, though, which are character specific. Yuffie's are Greased Lightning, Clear Tranquil, Landscaper, Blood Fest, Gauntlet, Doom of the Living, and All Creation.
- Greased Lightning
Yuffie does a combination attack, one up close and one distance attack.
- Clear Tranquil
Restores minor HP for the entire party.
- Landscaper
Yuffee slams into the ground and creates Earth damage to the enemy.
- Blood Fest
Yuffie brutally pounds all enemies ten times.
- Gauntlet
Damages all enemies with blue light power. It hits powerfully for special damage.
- Doom Of The Living
Yuffie slashes fifteen times at random monsters.
- All Creation
A massive beam slams itself violently into the enemy party.
So, there are quite a few special attacks she can do.
If you really want to learn more about these, I am sure there are videos of them up on Youtube. It'd be amazing if you actually did any of them in the Mock-Battle. ^_^