Deletion of files/folders/text by 2nd user on my mac

New Contributor

I am having problems with my gf using my Mac. She has her own account in my Mac and I am the admin and she is secondary users with access to most everything. There are files and folders with data collected that she has been deleting using her terminal and or sending them to junk for deletion. How to block that user from using terminal and block file/ folders from being deleted without my access passwords.?