My chameleon usually lay their eggs all at once. But just leave the sand box in there for awhile and see if she will still continue laying. If she covered up the eggs, I would suggest you dig up the eggs (put those eggs in the same orientation when you dig them up, incubate them in moist perlite/vermiculite half buried) and then place the sand bucket in her enclosure again. She might need to warm up a little and regain some strength before digging.
There is one incident where there is a female panther laid 22 eggs and left the 23rd in the body. She died soon afterward.