Balikbayan visa (privilege) question

Hi all,

My mom will be traveling to the Philippines in a couple of months and she would like to avail of the Balikbayan privilege that allows her to stay for 1 year.

Can she avail of the Balikbayan visa (privilege) without her old Philippine passport and PSA birth certificate?

She was born in the Philippines before 1945 and in WW2 the records in her province were destroyed during the liberation campaign, hence no birth certificate.

She is a naturalized US citizen and she said that she had to surrender her Philippine passport to the US immigration office upon receiving her US citizenship.

Without these two documents, Philippine passport and PSA birth certificate, would there be a problem in obtaining the Balikbayan privilege?

I have read on the website of the Philippine Embassy in Washington that a naturalization certificate is sufficient in lieu of the above documents.

I'm asking my question here because most articles I've read and videos I've watched do not mention the naturalization certificate as a valid document to present at the port of entry.

I would greatly appreciate hearing from those who have experienced the scenario I've described or know of anyone who has.