Created and sent a Contribute Connection key to Jennifer, who got going with it. After trying it for a while she asked for additional capabilities, so I opened Contribute using the Administrator Connection key, then modified the attributes on the Publisher user to allow deleting of files, uploading of non-webpage files.
I also set that user to look at only one css file (humanities_contribute.css) for styles to include in the styles dropdown. I then moved a small number of styles from humanities.css to humanities_contribute.css. I then modified all the php pages on the site to include both the css files. Any style that is in that css file will appear in the dropdown in Contribute. I'll move or add styles based on input from Jennifer.
Sent Jennifer an updated Contribute Connection key for the Publisher user on that site.