My sister will only attend weekday Masses. She served as a military nurse for 20 years and suffers PTSD from three tours; two in Afghanistan and one in Iraq. When she is in an environment of many people in a confined space then her PTSD is very heightened, such as a large parish. She lives in an area where all parishes there have a great abundance of Sunday faithful. Therefore, she goes to the sparsely attended weekday Masses and volunteers at the church.
Some say she is in mortal sin for not going on Sundays. Is she? Or can the weekday Masses fulfill her Sunday obligation? The pastor of her parish has told her it was okay for her under the circumstances. He has said because it does fufill the Sunday obligation, she does not require the Eucharist at home via an EMHC on Sundays. However, the military chaplain, who also knows the circumstance, has told her it is mortal sin.