No, Paula, not picking on you.
I just call things as I see them, regardless of the source. My experience and perspective are often different from what others post. Happy to join you for coffee - my treat just to prove I am friendly, kind and generous!
When Sanaseveria roots get completely dried out from inadequate water, they don't go deeper, they just dry up and die back, which is how Morgana described them. The shriveling is consistent with either over or under watering because either will cause root dieback and keep the plant from absorbing water.
I am not completely sure that underwatering was the problem here, but it certainly is a possibility given the information provided.
Now, can we just be friends!