Greetings. Congratulations, and that is totally normal. She will likely spend hours in there. I even use a stethoscope to listen at the side of the tub when our female veileds disappear from sight. They dig loooong tunnels, and I can hear them scratching around under there for hours.
I do peak over the top of the tub now and then to check the surface to be sure there are no cave-ins.
Other than that I leave them alone, and I really try to not let them see me peak over the top.
If you do take a peak, you may see her nose poking from the tunnel, meaning she is laying her eggs. This she may do for hours, as well.
Eventually you will see her back end, as she fills in the tunnel.
But, be forewarned, there are some females who will spook if they see you peak in. They may then stop laying, and could become egg bound. It does happen, so, the best thing to do is to leave her alone completely.