If she's laying I'd leave them alone. The bigger questions is why do they keep apparently obsconding. Until you answer that question you are only working with the symptom not the cause. Take care of the cause and the symptom takes care of itself.
I've got a 5-frame OB hive (only +/-6 weeks though) and had some challenges at the very beginning. Bees have trouble walking straight up and down the interior of a 2" PVC pipe. I lost a couple thousand bees in 1 week before I figured out a solution. Hang a 1 inch strap all the way down the pipe for them the climb on. It's been smooth sailing since but would have invariably ended badly had the cause not been dealt with.
The why is a very good question, but is probably because of yours truly :-X
I had one that abscond last year in my OH. I tried to never open it up, and just observe. It got too big and created swarm cells, getting ready to swarm. It was great to watch. However, since it was only 3 deep frames, when they swarmed they left too few bees behind to take care of the hive. Wax moth and SHB larvae quickly moved in, and the few bees that left didn't have a chance, so they left.
The one that abscond last week was again my fault. I opened the hive up to mark the queen to make it easier for others to see her, and I kinda ended up manhandling the queen (oops) but ended up marking her. When I sealed them up I couldn't find the queen. Fearing I crushed her, I opened them up two hours later to verify the existence of the queen. The marking, manhandling, and 2x opening stressed them out, and they flew away.
This time, when I installed them I figured I could just mark the queen when I install them, so I don't stress them out by doing it later. I picked up the queen to mark her, but accidentally only grabbed one wing. She started spinning around in my fingers. I freaked (thinking she was going to injure herself) and accidentally dropped her. She ran from me, and it took me a while to get her back home. That's enough stress to make anyone want to leave.
And yes, I learned my lesson, even if it takes me a while . . . . I'm not going to mark the queen in my OH anymore!
But, if they do get stressed, Id like to know how to make them stay.