Use WordPress, that easy thats best. But i have one custom made script i made for one client project, it use dump txt file for storing content text. That could be used too.
What was the feedback from your client? Did she adapt to WP? Just curious, I've been considering making WP my go to CMS for the brunt of my client's projects.
If you need more power and flexibility go with Joomla! Its highly customizable and its plugin is unlimited.