First, create a new editor login for her. User Accounts->Editors->Create User Here
Then, step by step instructions:
- On dad's Mac, launch the Safari web browser, go to site and login.
- After login, browse to the content you would like to edit, for instance Beethoven's story.
- While viewing the content you wish to edit, click the pencil icon in the toolbar to switch into editing mode.
- You may or may not be prompted that someone else is editing the content. If necessary, click the "New draft" button.
- Then an editing window appears.
- Make your changes in the editing box. Make a big mistake, click discard draft and start over.
- Otherwise, when finished, Click "Send for publishing"
Step by step instructions In pictures --
http://www.lakedata.net/index.php/eng/eZ-Publish2/Web-Content-by-Mom