We can have clear expectations of our employees (as we should). There is a tacit agreement with both parties that includes obligations, expectations, and responsibilities.
While we expect a strong performance of employees, the same individual also leaves work and has to face the various challenges their personal lives present. It cannot be divorced. If we want the best from them, they holistically need to be at their best.
Sometimes, all it requires is a little caring and compassion. Step back and ask a few questions. A little support goes a long way, and in turn, there is often reward beyond the investment required, if any was at all.