Comment by chadwickthebold

This is an interesting problem, because it's not unique to technical writers.

Some suggestions: * Mozilla. https://www.mozilla.org/en-US/contribute/ , https://developer.mozilla.org/en-US/docs/MDN/Getting_started Shoot them a mail and they can probably connect her with a project to work on. MDN in particular can always use someone to browse through the contributions and correct/improve them. They'll even connect you with a mentor to get you started if you ask!

* Open Hatch. http://openhatch.org/search/?q=&contribution_type=documentat... I've tried to use this site in the past, it's a little rough around the edges but if you're looking for single bite-sized tasks you may find them here.

Other than that, try browsing Github issue lists and seeing if there's anything that strikes your fancy?