I think this is approximately as true as "Customers make purchasing decisions approximately 95% based on product quality and 5% on those trivial details like marketing."
By all means, build stuff. But after having achieved some level of building stuff, the returns are far greater in attractively marketing the stuff you have build versus continuing to build more stuff, on a ROI per-hour-invested basis.
I mean, clearly she can build stuff, right? There's a portfolio. It has stuff in it. Achievement Unlocked: Stuff Got Built. That portfolio could have one extra 100x100 thumbnail that no decisionmaker is going to click on anyway, or, this site could exist. Do you think the thumbnail will matter more than this site existing? That strongly does not match my experience with how people approach decisions in the real world.
P.S. Takeaway for all engineers in the room: if you have three projects on Github and don't have one of these sites built yet, you will have far better returns on time building a site like this than you will doing another OSS project, and you will have still better returns doing actual networking rather than hoping someone on the Internet will stumble across your hidden potential and give you a shot.