For the sand, just leave it be they're very sensitive to stress if you mess around at all, stick hands in, add sand, subtract sand, move things, cloud up water, etc all it will do is reduce your chances she makes it.
I know you're concerned and want the fish to do well, honestly she's doing pretty well I would be thrilled. Leave the light off for a few days even. Feed only very very small amounts (she will be able to see with minimal sunlight making it in).
The first 2-4 days are critical. Keep areas down as much as possible.