The word mortificas is the present form of mortificar in the second person singular.
See the full mortificar conjugation
¡Sé que te mortificas a ti misma por ello!
I know that you've martyred yourself to it!
Matthew, ¿por qué te mortificas?
Matthew, what are you beating yourself up for?
¿Por qué me mortificas?
Why do you goad me?
¿Por qué lo mortificas?
Why did you hurt your father?
¿Por qué me mortificas así?
Why are you giving me such a hard time?
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