I also would suggest Etsy and there are plenty of other sites as well. Zibbet, bluejay and yardsellr to name just a few. I get more sales on Etsy but also list on Zibbet and bluejay because they are free to list so I don't lose anything. There are also some facebook pages for crafters. Starting small without investing a lot of money might be better for her. She could learn a lot from the communities on these sites that would help her a great deal. Etsy has newsletters for their sellers that have loads of great ideas.