Answer:
For 2019, the maximum amount that any individual can elect for salary deferral treatment on a 401k distribution is the lesser between: 100% of their salary or $19,000.
in this case, Amber earns much more than $19,000, so the lesser amount would be $19,000.
If Amber contributes more than $19,000 to her 401k account, then she would have to pay taxes for the extra amount contributed.