PIO to OCI (for Dual Citizen)

This is the current situation of my family

Myself , Born in India , Living in UK now got British Citizenship, Surrendered Indian Passport, applying for OCI

Spouse, Born in India , Living in UK now got British Citizenship, Surrendered Indian Passport, applying for OCI

Son, Born in UK, had Indian passport initially, got british citizenship, surrendered Indian passport, applying for OCI

Daughter, Born in USA, American citizen by birth, never had Indian passport, she had a PIO card which we applied and received in USA. She moved to UK with us and now got British citizenship (Dual citizen now). We are applying for her OCI now.

The questions I have are -

1. When we apply for OCI for my daughter, do we need to send her PIO (original) as well and will that be cancelled, once she receives the OCI ?

2. Do I need to send the copy of her American and British both the passports or only British ?

3. The OCI sticker will be placed on British Passport only or on both British and American passports ?

4. As she never had Indian Passport, so do I need to submit any affidavit along with the application ? (Or is the proof that she already had a valid PIO sufficient for that)