A message like that tells me that someone has either hacked your site or is attempting to hack it. Tell your wife to get in touch with the webmaster of the site (unless she is the webmaster) as well as the people who host the site.

Do not give out any information like what is being asked for. A legitimate ISP/Webserver Host would already know what IP Addresses you use/have and would also have legitimate physical contact information. There is no need for them to not physically contact you for information EPSECIALLY when there is a DNS problem like the message states.