Windu will start with defensive methods; there is a relevant Jedi philosophy about never attacking unless necessary, and in theory the primary use of the lightsaber is to defend oneself. Windu trains her in each of the basic positions until she can move between them easily. They practice Soresu, with a training droid firing at her. Apart from just having the lightsaber in the right place to begin with, a key element is just being able to predict where it will shoot, and Kina has to practice with a blinding helmet, to teach her to use her Force reflexes without even looking for the droid. Windu has to modify a few of the techniques, trying to focus on teaching her angles to block with that point her lightsaber close to forwards, if she wants to fire backwards in return, as well as how to use two sabers efficiently.
After Kina can consistently block shots, Windu starts showing her some attacking techniques. They start with just the basics of how to enter a fight, integrating her previous blocking moves, but combined with a rush forward so that Kina can get to a closer range. Windu tries to focus on nonlethal strikes, and they practice both slashing through enemy blasters and using the Force to pin them down. But it's clear enough that the simplest way to stop someone is still to kill them, and so Windu does show her the best ways to do that, albeit with warnings not to do it when it can be avoided.
Finally, Windu shows her how to fight an opponent who also has a lightsaber - something that many Jedi are out of practice with, but might become very important if they end up under attack from Plagueis, or Dooku, or any lightsaber-wielding allies the Sith might have. At her age, Kina's not going to be physically capable of blocking a powerful strike from an enemy's lightsaber - she'll just end up with her own weapon pushed back into her. So Windu focuses on ways to distract her opponents, how to move away from their blades and force them to keep their attention elsewhere. If she uses two sabers at once, they'll be too busy with their own blocks to land a blow on her.
Throughout all of this, though, Windu is wondering when she'll ever need to use a lot of this. It seems like Kina is going to be capable of taking out enemies at a distance whenever possible, and anyone who tries to come close probably won't be able to hold up against her blaster and lightsabers. Really, the only time Kina would be challenged is if there are enemies coming from every angle. So he does teach her how to escape a battle. She's probably too young to be able to consistently leap over enemies, even with the Force, but she can use her small size to her advantage, taking out one enemy and then dashing through the gap. They practice against groups of both training droids and people coming at her from every direction, focusing on how to get to the side, where she can block more easily.
Watching Kina, Windu is... not relieved, it is wrong to be relieved, it would be a very good thing if she became the galaxy's greatest lightsaber combatant. But nevertheless, the part of him that keeps getting shocked by her absurd skill levels is going to feel a guilty amount of contentment at knowing that she's not perfect, no matter how ridiculous that might be. She's obviously far past anyone of her age, but she is notably not going to be at a Master level any time soon. The few times that Windu deliberately tries his best instead of giving her opportunities to hit him for learning's sake, Windu wins. The top lightsaber fighter in the galaxy really shouldn't be proud that he can beat a ten-year-old, but after everything Kina's done so far, he legitimately thought there was a chance he wouldn't be able to.
Unfortunately, this also means that she isn't going to be able to beat either of the Sith. And while it really really really shouldn't come to Kina fighting a Sith Lord, it could end up happening.
Well, if she can't win in a fair fight, then she shouldn't be fighting fair! Windu will teach her tricks to get around the usual methods of combat! Ambush ambush ambush! Blaster blaster blaster! Force Force Force! He is going to try his best to make her able to beat him someday, even if that does infringe on his status level!