SSDI Approved Two part question

My mother got approved for SSDI   in the late  year  (2021) …in total she received about 3k .  She had spoken with a SSA representative who told her , since they are not tax experts …it would be …in her best interest to speak with a tax profesional to see if she would have to file or not (which also included  …a W-4V form..being sent to her  mailbox  ).. because  according to them….that’s what …she will need to bring ….when she talks to a  tax advisor .  So my first question is… does she have to file (for year 2021)   , if that’s her only income ?  

My second question .  
Since she’s been approved  to receive SSDI for  year (  2022) ..based on the total amount of benefits… she’ll collect for that entire year ,

( which will be around 13k to 14k)
 Does  she have to file next year  ? If that’s her only income ?