Can Women/widows perform Salagrama Aradhanam in Sri Vaishnava tradition? To suit present days, pray to advise the duties that can be performed by ladies who had performed sharanagati, through mind, body, and words for Tiruaradhanam.

Women are not allowed to touch the Salagrama. Ladies can provide relevant assistance during Tiruaradhanam.
Notes:
Some of the duties ladies can help with for Tiruaradhanam are – clean the dais or sanctum, draw kolam, wash Tiruaradhanam vessels, lighting lamps, gather flowers and fruits, prepare scented items (this includes powdering cardamom, edible camphor (pacchai karpuram)) for Perumal tirtham, prepare dhoops, etc.
The most important duty is preparing the prasadams that are offered to Perumal during the bhojyasana of Tiruaradhan are prepared. One must prepare oneself by physically purifying, purifying the place around, chant Azhvar pasuram-s and prepare with sincerity, following the prescribed by scriptures.