Hi there and welcome
you mean you want to see if she installed something to track your activities on the macbook or malware?
It depends, she may just wanted to use the computer while you were away. If she has her own computer there, then it would be suspect, but if she does not, then it sounds pretty normal.
Apart from websites, you cannot see though what she actually did, the Mac does not recall this.
But you can view the history in Safari and see what sites she visited.
You can see if she actually logged in on the Mac...
You look for an entry Wake Reason.
Zip Drives are not actually used anymore so this has nothing to do with this.
But if you want to see if she used it look for Wake Reason ion the console.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.