She seems to have no nesting instinct at all.
When pullets first start to lay some don't seem to mmediately have that nesting instinct, they just drop the egg wherever they are. The egg laying process is pretty complex, some pullets just don't get it right for a while. That's not just putting the egg together properly in their body but when and where to lay it. They may lay an egg from the roost at night or, like yours, just walking around. Most get it right to start with but I've had some that take a while to gain control over that part of the egg laying process.
I understand you are not trying to attract her to a specific nest or just any of your nests. She won't even return to an area somewhere else to lay an egg. She seems totally oblivious that the egg is coming.
Practically all of mine that have that problem figure it out in a few days. They either start laying in one of my nests or at least return to the same spot every time to lay the egg. Two weeks is a long time but she may eventually catch on. I don't know of any way to train her to at least go to a nest, her own or one of yours. My suggestion is to continue to give her time.
I had one that was special in certain other ways, even as a baby chick. Two floats and a marching band short of a parade. Her instincts and problem solving skills just were never that good. I made sure to not hatch any of her eggs.
Maybe closer to your case I had a pullet that never did learn to lay her egg during the day but always dropped her egg from the roost at night. There are certain triggers that tell a hen when to release a yolk so the egg will be ready to lay during daylight. Those instincts were not there for that pullet, she was laying that egg from the roost for over a month. And they should have enough control to delay laying the egg for a while if she needs to anyway. I figured a month was long enough so I ate her. I raise replacement pullets and eat the ones that don't make the cut to keep so she made that decision easy.
I'll repeat, I don't know any way to instill instincts that aren't there. She may still catch on so you can give her more time. Good luck!