At this stage she is busy making roots for support and an efficient water and nutrient "capturing" system for supporting life and further growth.
Soon enough she will take off, but the first 1-10 days can seem as though nothing much is happening.
This is not a problem and not caused by doing anything wrong, but a developmental stage while the plant is establishing itself for the future.
In a day or three, the next set of leaves should appear, and once they do, growth should take off rapidly.
Hope this helps,........
Organoman.