@MomoStark, there can be a couple of things going on here that I can think of.
First, did you get any notifications that the child was actually late for shcool? Did the principal call you child on the phone to tell them they were late?
If you look on the panel that you shoudl be able to click on her to go to school does it say how long it will be until school starts for her? This should be in the upper right of that panel. It will usually say something like Class in 15 hours, or 3 days till school, etc. What does your panel say in this area? 🤔 I think this might be happening since you aged your toddler up during the day. It sounds like this child might have most likely glitched during either the ageing up or maybe when you had them take a vacation day. If a toddler is aged too during shcool hours or very late at night, they won't go to school the next day, but the panel should say so. It will be even longer if the child aged late at night on Thursday or in the middle of the day on Friday.
I would suggest looking into this before trying the next thing, which is...
Also,since you used to play with Mods/CC i would normally advise not just removing the Mods folder but deleting certain files (because sometimes corrupt bits can remain in your game even if you have removed the mods folder) and then doing a repair though Origin to be on the safe side. If this wasn't the same proceedure with Macs, I would think @Bluebellflora would have not moved your post here, so I will include how to do this:
1) Move the Mods Folder to your desktop
2) Delete localthumbcache.package file in the game folder.
3) Fix you game in Origin by logging in and go to Library, then right-click on The Sims 4 and choose the "Repair Game" option from the list. Wait until Origin finishes repairing all your packs and not just the base game.
4) Now, when you turn on your game again, it will create a new mods folder that will be empty.
(There would be more instuctions on how to find the faulty Mod or CC , but since you dont' want to use Mods anymore, I won't include that! ) 🙂 And you don't need to move back an empty Mods folder as the game will generate a new empty one when you start it up again. 😉
