There's several different ways you could keep Heidi's site going, or replicate it as a memorial site.
I had only seen her on different news clips or stories online, so I can not, and I will not make any comments about someone I never had contact with.
What I can say is this: Much like her, when her father finally passed on, she felt she could be more open and free about who she really was inside. I recently lost my father on September 19th of 2008 and I immediately reached out to my mother and began being more open and honest about my personal AB side with dear close friends I trust and friends I have made in the North Carolina AB community.
The first thing you should do is visit GoDaddy.com or another domain service and see when her URL subscription runs out. You could also contact whoever her provider was and try to make arrangements to either take over the website domain, or wait until it runs out and get it (the domain) into someone's hands who could rebild the site and keep it going in her memory.
Heidi obviously had a huge following and admiration in the community. Now the community should step up and attempt to keep her website going as a way to show people in the common world how close we all are.
I hope all of you who feel a sense of loss find an inner peace at some point down the road.....