Got my 5th! I went out to check on the chickens, give some foliage, and hang out with them for a few. When I got out there I noticed Quail was being "whiny" and going on and out of the coop. One of the bigger pullets was chasing her back out. So, I distracted the bigs with the foliage, and stood guard in the doorway. Quail went to the nesting box, and sure enough within just a short time (idk, maybe 10-15 or less, didn't time track) she laid an egg.
I've never had to actually stand guard before. She's been laying for a couple weeks now. All the other girls had already laid and I collected earlier, so not sure what the issue was, but I took care of it by not letting the offending pullet back in until Quail was done (and offending pullet was a little more than ****** too lol).