client moved domains on me, broke site

This was a volunteer job for an area non profit. They wanted wordpress so their staff could easily make changes. I built a wp site for them, and then within a short period of time they went and changed their name and domain. Now, I can’t even help them get into their admin page. I’m assuming that wordpress just needs to be re-installed and the database re-imported?

Ugh.. all that time lost..I wish they had told me and I would have asked them to wait until they got the new domain.

Anyway, I was hoping there was a way to get in there with a magic “change all kinks to the correct domain” button, but I fear not.