Truthfully, there's no 100% sure way to know.

To log in to a remote machine, whether it be another Mac, Linux box, or anything else running SSH, open a Terminal Hack #48 window and type:% ssh -l username remotemachine. Substitute your login name on the remote machine for username and the name or IP address of the remote server for remotemachine. However, before you can access your Mac remotely, you’ll need to configure your device for remote access using these simple steps: Open System Preferences. Click on Sharing. Click on Remote Management. Select which users are allowed to access the Mac remotely.

Logmein may have a configuration option where they can connect again at will without approval. If they set that up, they may be able to still connect. They may even be able to access your Mac without being noticed.

Your best option is to bring your Mac to a trusted partner and have them look. Or reinstall OSX to overwrite any modifications they may have made.

Fwiw, if they took the data for her credit card information from her notes, there's no need to also take the notes.

How To Clean Up A Mac

Have her advise her banks anyway to be safe.