In Jain dharma, widow women are not considered an omen of badness or inauspiciousness. The soul is equal; a person’s spiritual worth does not depend on being married or widowed. Jain principles do not support treating a widow as impure or unlucky.

For welcoming with aarti during engagement, this is mainly a family and community custom. If your Jain tradition and family allow it, a widow can do aarti. There is no Jain rule that forbids a widow from performing such a respectful auspicious duty.

So, in simple words:

• Widow = not inauspicious in Jain dharma
• Aarti/welcome of son-in-law during engagement = allowed if your tradition permits
• What matters most is bhavna, purity, and respect, not widowhood

If a family follows a very strict custom, they may choose differently, but that is social tradition, not Jain dharma principle.