I'm not going to try to do the pain and suffering of the Green family any justice. However, I found this today and thought I would pass along.
The Green family has set up a fund in Christina's name. The Community Foundation for Southern Arizona does the following:
Works with charitably minded people and organizations to strengthen Southern Arizona communities. We build relationships with passionate individuals, generous families, prudent professional advisors, innovative nonprofits and benevolent businesses to create the wide spread change our community needs.
Since Dallas Green's granddaughter had just been elected to student council and dreamnt of a career in politics, this seems rather fitting.
You can donate here.
Letters of condolence can be sent to the Green family at firstname.lastname@example.org (Dallas' son is a scout for the Dodgers).