I Messed up today! I killed Chelas' website.

Six weeks ago we registered the address mrnobodyspecial.com with JustHost.com .  We, as always, have had nearly every moment taken up by needful things. Chelas and I have an art studio and gallery in downtown Lancaster PA. I have wanted to get something, anything, on my website even something as simple as an under construction page before I finish and send out my business cards to be printed. Chelas has been working on her website chelasisashowoff.com for two years. It is a fabulous site that generated a quarter million hits this year. We bought my website through  her account as they claim that she can host unlimited domains and unlimited bandwidth on it.   ....Just Host Sucks...  We were thinking of changing hosting companies when it came time to renew her account recently as they changed prices and assessed random fees and we did not know at the time how to back up the files to our personal computers (I learned how to tonight). So I tried to set up my new domain with a basic site builder and it somehow built it on both my site and on top of the main page of Chelas' site. All the other pages were left in place but they are no longer connected to the old home page. I'm still unclear as to why it did it this way as i even double-checked that it was only pointed to my site prior to clicking ok to the installation. So now Chelas is way mad at me (with good reason).