Q&A for How to Know when Your Computer Was Last Used

On the right side under where it says "Action" you click "Clear Log" and it gives you the option to save and clear or to just clear the logs.

You can use a batch script to do that. Copy and paste this code: @echo off if not exist "C:\Login History" mkdir "C:\Login History" if not exist "C:\Login History\history.log" echo Login History>"C:\Login History\history.log" echo %userdomain%\%username% logged in at %date%%time%>>"c:\login history\history.log" Then, save it as C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp\anyname.bat To view who logged in, open C:\Login History\history.log

Yes, via the system log within the event viewer. It will show you the date and time of the events and you might be able to tell if there is something suspicious.

Click on Windows "Settings" > "Update & Security" > (scroll down to) "View Update History". Look in there for the new update that she made on that date and time.