Default Galaxy Ring - randomly lost all contacts

Hello! New here...
Couldn't find a forum for this phone, figured this was the best spot for the post.

My mom has a Galaxy Ring phone for VM. The other day, she went to text someone only to find out that all of her contacts had been randomly erased. She is able to add contacts, but we don't know why they disappeared. Is there a way to recover them?
Thanks in advance!