I see. I didn't know what the situation was. It might have been the other chickens, but could just as easily, (and more likely) have been predators of some sort. You mentioned raccoons, I had a problem with those earlier this year. One of my mom guineas had 17 keets, and they were fine for about 3 weeks. I thought they were home free, then a band of raccoons struck. In 4 days, she lost all but 3. I trapped the coons, one at a time, and made them go far, far, away. (To a place nowhere near any human habitations, so I did not give the problem to somebody else.)
Usually moms are able to keep other chickens from bothering their chicks. They normally have a few quick scuffles, and then the others leave them alone.
If she's laying eggs, she's not still broody. They don't lay while broody. Sounds like maybe she was broody, lost her nest, and is no longer broody. If she was broody, she would be setting somewhere, good spot or not.
So are you trying to get her to set again, or just trying to get her to lay in one consistent spot?