The first question to ask is what you want to use the website for?
If you are looking for her first website that is easy to use and a template format, then Advanced Access may be a very good choice. You have the option of using much of their standard material to get you going and you do have the option to create unique content yourself. I had an Advanced Access site for years and used it this way.
But, the major limitation is that it is difficult to get rankings in the search engines if that is your objective. Some AA sites rank well on Google because they have a lot of original content and very little of the canned, standard content. But it is very difficult to rank on Yahoo with an AA site.
Last I heard, Advanced Access did not have a built-in blog. That is becoming almost essential to get good search engine rankings. I heard the leading search engine here from Google actually say that WordPress was the most search engine friendly platform available. So, you might want to investigate a platform that incorporates a WordPress blog with a real estate website. One example of that is the provider I use. The url is listed below.