Wow. Just--wow. If your mother is a believer, Christ lives in her--Are you saying that is not beautiful?
If she is not a believer, then Christ thought she was beautiful enough to die for her--after being flogged and whipped and crucified. Who are you to say differently?
But if you insist on applying the World's impersonal and objectifying standard of "beauty" on your own mother, then I can't dissuade you from lying to her.
“then I can’t dissuade you from lying to her.”
Sophistry of that intensity approaches lunacy.