I agree with Laura
Multi site is the only way to go for a good results.
you can't get the dead site selling great again, even if you have some content left, i guess it's not much.
You can make a new multi model site with much better design (this one is not great at all, to be honest), and Leah will be a main model, + you will make an announcement for the new , never realized sets of her, and keep it with new updates. (her and other models)
This way you have a chance for successful site, other way...it won't work (in my opinion)
Good luck !