Jaina versus the Soresu Master. RotS Kenobi was classically trained, and among the best swordsmen of the Order. Jaina was trained in unorthodox methods that Kenobi might not be able to handle. Her Force Potential is also much greater than his.
1. Saber
2. Rather than a Force contest, lets imagine that the two simply don't have their lightsabers.
3. All out
1: This is tough, On the one hand, Kenobi actually has use of lightsaber forms, which, as Dooku said, is a huge advantage as it can actually let you fight about 6 moves ahead, via the sequences of each form. On the other hand Jaina is a mandalorian trained badass, and since Kenobi couldn't even take the kick of an exausted, 70 yr old dude, I hate to think what Jaina-Ikilledmyownbrother-Solo could do. Too close to call.
2: Jaina. Force Lightning FTW
3: Jaina. See above.
Don't forget how much Luke Skywalker sucks in LOTF because of his old age.
__________________ "You must begin by gaining power over yourself; then another; then a group, an order, a world, a species, a group of species... finally, the galaxy itself."
- Darth Plagueis
"She may be small but she packs a punch and when shes in this mood...she goes for my danglers" - Oghren, Dragon Age