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In a lot of ways, in a bigger picture without favoring one game or the other, she seems to be a Sorc/Oracle / Mystic Theurg. She casts from both Divine and Arcane equally proficiently, but also isn't a super powerful caster.

But then again, unlike Link, her loadout changes from game to game.
It would be fair to say while Link's "player" is in love with Ranger and plays Ranger steadily from Campaign to Campaign, Zelda's player likes to switch it up and try different classes and combinations each time there's a new campaign

My idea for hollowing is when you die, you make a DC 5 (+number of previous Deaths) Will Save. Every time you fail, you get -1 to all mental stats. When you reach 0 in any mental stat, you become a Fast Zombie, and lose control of your PC.

Humanity acts as a Lesser Restoration to remove these negatives.

Also, when you die, you resurrect at the closest Bonefire after 1d4+1 days

Se but he is a paladin and they have 3 full casters. The paladin gets like 3 attacks max and he doesnt shut down anything.

The full caster can just autowin. Martial cant.

And he can. If he tarpits the paladin then the rest of the party can deal with the other threats.

Correction; Caster are not autowin. They require work and proper planning. They are only autowin when you remove all context of the situation. When you don't know the full context of the situation, it's best to ask.

To address the quandary of the OP though, best bet: Cut him loose, don't invite him back, and be an adult about it. Let him know his immaturity makes everyone uncomfortable. I know you don't want to lose the sorcerer, but you just may have to. I know when my party was running Rise of the Runelords, we had started out with 5, but one player liked intra-party conflict a bit too much, so we had to ask him to leave. We also lost his girlfriend setting us up with only 3.

The AP after that the AP did become more stressful, but it also put the remaining 3 of us on top of are game. We were still able to finish the AP with 0 PC deaths and accomplished everything flawlessly.