Yes, I live solely off of my writing. That said, I do not live solely off of Hubpages. If your sister is just now starting from scratch, she has a lot of scrambling to do if she needs to be able to make the bills right away, though if she's willing to work hard in the freelancing marketplace as well as affiliate sites then she may be able to do it. She also needs to understand that this really is WORK, and will require a daily commitment of focused time. I've been full-time for just over three years, and now I can usually make my commitments with 6-8 hours per day during the week and a couple of hours on Saturday. When I started, it took 80-hour weeks to make what I'm making now.