So everything is the same set up as last time when she did lay? Are the tunnels caving in on her as she gets deeper in or is she changing her mind and covering them? For our girl we use a mixture of sand/vermeculite moist enough to hold form but not sopping wet. She has laid 3 clutches but each time she would start then stop over and over again. So them we dug her a cave and put her in it and she took over from there. All 3 clutches exactly the same, we start it and I mean really get it going for her, then put her in and so on. She will come back out when she is not ready but then off and on we just gently put her back then all at once thats it. I know though that each beardie is different. Some they say like 100% privacy. Maybe you can try to start the tunnel/cave for her dig it back pretty good then just gently place her in it. If they are caving in possibly it isn't packing to her taste and if she is changing her mind perhaps she just isn't comfortable with the set up? So the light is on the side she lays or the opposite side? Our girls laid 4 weeks to the day in between #1 and #2 and 3 weeks to the day between #2 and #3. You could feel all the eggs in her belly too.