Right to rites.

Let's first understand the hierarchy of rights to perform Shradh in detail according to Garuda Purana. If an individual does not have an elder or younger son, the ritual does not stop. 

According to Dharmashastra, the order of eligibility to perform Shradh is as follows:

Son (elder or younger)

Grandson or great grandson

Wife (if the husband has no direct descendants)

Daughter

Daughter's son (maternal grandson)

𝙎𝙘𝙧𝙞𝙥𝙩𝙪𝙧𝙖𝙡 𝙋𝙧𝙤𝙤𝙛𝙨:

Garuda Purana (Preta Khanda):

 "पुत्राभावे तु पत्नी स्यात् पत्न्यभावे सहोदरः। तदभावे च दौहित्रः कुर्यात्पुत्रवदेव हि॥"

Meaning: In the absence of a son, the wife; in the absence of the wife, the real brother; and in their absence, the daughter's son or the daughter herself, acting in the capacity of a son, should perform the Shradh.

 Garuda Purana (Dharma Khanda):

 "सर्वेषामप्यभावे तु स्त्रियः कुर्युः स्वभर्तृषु। पुत्राभावे स्नुषा वापि दौहित्रा वा तथैव च॥"

Meaning: In the absence of all others, women should perform Shradh for their family members. In the absence of a son, the daughter in law, daughter, or maternal grandson has complete authority to do so.

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Manu Smriti (Adhyay 9, Shloka 130):

 "यथैवात्मा तथा पुत्रः पुत्रेण दुहिता समा। तस्यामात्मनि तिष्ठन्त्यां कथमन्यो धनं हरेत्॥"

Meaning: Just as a person's soul exists in the form of a son, in the exact same manner, a daughter is equal to a son. Therefore, a daughter possesses the equal right to offer Pinda Daan and receive inheritance just like a son.

Real brother or nephew

 Disciple, friend, or a worthy person receiving charity

Therefore, not having a son can never be a reason for Shradh not taking place.

𝗩𝗮𝗹𝗺𝗶𝗸𝗶 𝗥𝗮𝗺𝗮𝘆𝗮𝗻𝗮 (𝗧𝗵𝗲 𝗚𝗮𝘆𝗮 𝗘𝗽𝗶𝘀𝗼𝗱𝗲):

When Lord Shri Ram and Lakshman went to collect materials for Pinda Daan, Mother Sita offered pindas made of sand to King Dasharatha's yearning soul on the banks of the Phalgu River. King Dasharatha appeared in person and accepted the offering directly from her hands. This stands as the finest scriptural and historical evidence that a woman or daughter has the right to perform Pinda Daan.

Vayu Purana (Gaya Mahatmya Section):

The second half of the Vayu Purana contains a comprehensive account of the significance of the pilgrimage site of Gaya. It specifically mentions "Sita Kund," detailing the story of Mother Sita offering pindas made of sand. Even today, Sita Kund exists in Gaya, where pindas made of sand are offered.

Even today in Gaya, the tradition of women performing Pind Daan remains recognized and accepted, with Mother Sita's conduct at Sita Kund regarded as the foremost example of this practice.