Mom 485 Interview - what to expect

[offerrp]

Hi - My mom got an interview notice. i filed her 130 Oct 2017. EAD & Parole had elapsed ( she did not work). So she could not travel back. Reapplied for Parole Nov 2018 and no word yet.
But in the meantime got the notice for interview. she is in her mid 70's. no intention to work. what to expect in interview? Would they ask why she didnt work but apply for EAD?

Any experiences please share

Thanks
Good wishes

[offerrp]

Anyone that recently had their parents interview?

[offerrp]

Newacct - any insight into interview and what to expect ? Should we take all documents original and copies that we submitted during petition?