I've been doing freelance for a bit, and I've found that most of the sites where you have to bid for the work, the wages end up so low that it's not worth taking the project. My biggest suggestion, what's worked best for me, is to create a website. Once you've created a simple, uncluttered website, you can advertise your services on Craigslist or using Google Ads, Facebook Ads, etc. Then clients come to you, instead of the other way around. If your partner has any writing clips, it might be helpful to either list them on the site or build an online portfolio that potential clients can click on. Once they're further along, they can ask for blurbs from clients and put them up on a testimonial page.
Also! Query magazines and other publications regularly with story ideas, or send out letters of introduction to SEO companies, custom publications, small businesses, etc. You can do cold-calling if you want, but I tend not to just because I hate cold-callers.
Freelance writing is 80% marketing and 20% writing, in my experience. You have to keep marketing yourself like crazy, even when you have billable client work.
If your partner needs some more insight, they can look for helpful blogs--there are tons--and check out these two sites (neither of which I am affiliated with, but I read them regularly):
http://www.freelancewritinggigs.com/ (this site posts job opportunities, if she'd prefer to apply for jobs that are already available)
Lots of luck!