After a month it should not be a control issue. I've had several pullets lay from the roost when they first start but practically all of them figure it out within a week. There are several triggers that tell a pullet or hen when to release a yolk to start the internal egg making process. It takes the egg around 25 hours or so from when the yolk is released until the egg is finished and can be laid. One of those triggers is light, the yolk should not be released too late to be laid during daylight the following day. When they first start to lay those triggers don't always work right, but usually within a week or at most two the pullet should get those bugs out of her system so she is only laying during daylight. That's why I was asking about lights, thinking lights at night might be messing with her triggers. Apparently not.
Another potential issue for pullets is that most seem to know when an egg is coming. They know it is coming so they find a nest to lay in. It may not be where you want them to lay, but it is where they want to lay. But some pullets just starting out seem to be surprised by those first few eggs. They drop it wherever they happen to be, the roosts or just walking around in the coop or run. This is something else they usually quickly outgrow. Since this one laid in the nest before I don't think this has anything to do with it. I think her triggers are just messed up so the egg is ready to be laid at the wrong time.
I had a pullet like this once. She started laying her egg from the roost and never stopped. After a month I started trying to figure out which one it was. It took about another month before I finally caught her still doing it. Since I had several other pullets to choose from when deciding which ones to keep I ate her, she failed an important test. The way I looked at it her triggers of when to release that yolk were so messed up that they were telling her to release the yolk at the wrong time. Otherwise at least some of her eggs would be laid during daylight hours.
I do not have any suggestions on how to retrain yours or otherwise correct the problem. I do consider it a problem. I'm OK with it for a week or so, just give her time to straighten out. Most of the time the eggs don't break when laid from my roost anyway. But if the eggs are breaking the other chickens may eat them, may will. To me that is not an issue unless one learns to open a good egg to eat it. I just don't want to take that chance.
This one I don't have much experience with. On really rare occasions I've seen a hen on a nest as it is getting dark to lay an egg but there is nothing regular about it. By rare I mean once every few years, nothing regular at all. I just put it down to something caused her to be a little late. As long as it is not regular I figure we are all entitled to an occasional oops. This sounds like it may be kind of regular. I don't want them sleeping in the nest because they can poop and leave a messy nest. Even if it is kind of regular but all she is leaving in there is an egg I would probably ignore it.
