You can't. And unless you're an editor you can't possibly know whether or not possibility (2) above occured.
There's also at least two more possibilities to add to the list:
5) The title and description of the original listing didn't meet our editorial guidelines. The site was later found by someone else and send back to be re-reviewed by the original editor.
6) The site was de-listed by mistake, since an editor thought that one of the other options above applied.
Though they're pretty unlikely compared with the others.
I'm afraid that you'll just have to be patient, assuming what you've said above is accurate. If you're site is listable, it will almost certainly currently be waiting in the unreviewed pool of a suitable category, and at some point a volunteer editor will come along, review it, and publish it. Since all editors volunteers and there are a lot of suggested sites waiting to be reviewed, I'm afraid there's no way we can offer any sort of timescale, or provide any way for certain sites to be given priority.