My sim disappears when she comes back from university

This looks like a different version of the game- not Sims 4?

University works differently in the different versions. 

Isla Paradiso is definitely The Sims 3, and so is the moving truck. You should probably repost this in The Sims 3/Technical-Issues-PC unless it gets moved there by a moderator.

I don't think the replaced items should be a problem but there's obviously something wrong. People who are still playing TS3 frequently are likely to have better answers than those of us who are mostly playing TS4. 

Oopsies thank you so much!!