I would assume she wants this because, 99% of “free” website builders nowadays, will allow you to create an awesome website on their domain, with a limited amount of space, and a crappy subdomain name. I am also looking for what she wants. As I assume with her, I want to be able to create my website easily, offline, and upload it to a host/domain that I already own, rather than using something like wix, with which, you have to pay 5 bucks a month, to link your domain name to the site.
You can make a website for free, but there are catches. Free accounts on website builders hold a lot of important features back. You can’t use custom domains, and your free site will have ads for that website builder. If you’re looking to learn more about website building then the free options are worth a look. However, if you want a professional, feature-rich website you’re going to have to pay at least a few dollars a month.