Is there a sin upon one who refrains from watching the sacrifice (udhiyah) being slaughtered—due to an inability to witness animals being slaughtered, especially for women?

It is preferable for the sacrificer to slaughter their sacrificial animal with their own hand, for those who are proficient in slaughtering. Witnessing the slaughter at the time of sacrifice is also preferable but not obligatory. There is no blame upon one who refrains from witnessing it at the time of slaughter, especially if there is an excuse for doing so.