@KennChrsitina Please press Play and start a new save. (No need to spend much time on it; this is just for testing.) Save your progress, exit to the Main Menu, click Load Game, hover over the folder icon under the new save you just created, and check the file path. That's where your saves need to be stored.
If the file path you see is different than the one for your existing saves, just move your old saves to the new location, and they should show up.
If the file path is the same, then somehow your saves aren't being read by the game. Try loading a backup of one of them; use the manual method described here:
https://sims4.crinrict.com/eng/2014/09/save-games/#wiederherstellen
If that doesn't help either, let me know.
@KennChrsitina The easiest thing is probably to disable OneDrive, or at least prevent it from syncing. You could certainly sign out of your aunt's account and into yours. But having Documents automatically synced with cloud storage can cause problems with Sims 4 no matter which OneDrive account is being used.
Before you do anything else, copy the Sims 4 folder or folders you want to preserve to your desktop. (Even better would be to copy it to an external hard drive or USB stick, but that's nto strictly necessary.) To switch OneDrive accounts, click the hidden icons arrow in the lower right corner of your screen, right-click on the OneDrive icon, and click More > Settings > Account > Unlink this PC.
Then if you want, you can open OneDrive again and sign into your own account. But make sure you choose a different folder than before, or else the content from the old and new accounts can get merged.
If you do want OneDrive on this computer, whether linked to your own account or your aunt's, be sure to prevent it from automatically syncing Documents.
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