Discover University can't move back in dorm??

You can cheat:

Enroll in University

If you shift-click your Sim with testingcheats on you can access a sadly very empty University Debug Menu where you can click, 'Enroll in University' to be immediately taken to the enrollment screen.

From: https://www.carls-sims-4-guide.com/expansionpacks/discoveruniversity/cheats.php

I'm sure you're not the only person to make these mistakes. The best thing to do now would be to go back to an earlier save, before Lana moved out of her dorm or at least before she dropped out of university.

You can do that by going to the main menu (don't save). Go to the Load Game panel and select Lana's save but don't load it yet. Click on the Recover Save button at the bottom of the panel, next to the Load button. Choose one of the earlier saves. This will create a new save with the same title plus (Recovered). Load that save and see if it's early enough. If not, go back and try again. Hopefully, you will still have a save that came before your mistakes.

Ah.. The thing is I've already saved it ;) Yay me :neutral: So now I'll just have to wait and just see jow long it will take for her to be able to re-enrolle to University.

Oh right I seem like a total idiot now :# I did cheat and enroll her with cheats after I got her to drop out, I got excited and it let her move back to the dorms but as soon as she got there the event "packing up" started and I'm assuming the game thought she was back to pack up :/ So guess no cheats for my sim.