Normally, a veiled chameleon will fill her hole in after she lays
the eggs. I have heard of the odd one not filling it in but
I suspect that it was because the chameleons weren't healthy.
There should be quite a size difference in the back end of the
chameleon if she laid her eggs unless she wasn't carrying many
eggs....but if she is done and back up in the branches, it
shouldn't hurt to look for the eggs. If the hole wasn't filled
in, its possible that she is just digging test holes and hasn't
laid her eggs yet.
If the eggs are fertile (if she has been mated....and I hope not,
because I think that she's too young) just dig a little bit of
the soil/sand/whatever you used away at a time until you find the
eggs. If they are likely to be fertile, let me know ASAP and I
will tell you what to do with them if you don't know.
If she hasn't laid her eggs, but has filled the hole in, then I
would be a little concerned.
Also...whenever a chameleon is digging a hole to lay eggs in, its
not advisable to let her see you looking at her. It may make her
abandon the hole.