A chameleon should/is supposed to drop all the eggs at once. However, sometimes they retain eggs and the only way to be sure is to have an x-ray done.
If they retain eggs, they will likely show signs of it...lethargy, won't eat, sit at the bottom of the cage, sunken eyes, etc.
She will likely lay more eggs if you keep her under the same conditions that you have so far. It could be in a month or two it could be longer.
51 eggs is quite a big clutch...more than the size of a clutch in the wild is reported to be. I would rather see my chameleons lay clutches in the area of 2 dozen because I think it means that they will live longer.
When my female veileds lay eggs, I feed them well for a couple of days until they get their strength back and then I cut them back slightly. I also keep the temperature a couple of degrees lower on them. (I don't starve them by any means.) Once I know that the female is working on another clutch, then I increase her diet somewhat again. Doing this seems to keep the clutches smaller (and the infertile clutches can even be prevented completely when this is done right)...and my females usually live to be 6 or so years old.
Please note...this diet/temperature control does not prevent all species from laying eggs.
Re: the females interest in the eggs after they are laid...I have seldom seen one show any interest in the eggs after they are buried to the chameleon's satisfaction and she has returned to the branches.