If your Mom writes a letter and her tone is one of 'questioning', she may get a civil reply. (It may not answer her question but it will be civil.) HOWEVER, if the tone of her letter says any buzzwords like UNSCRIPTURAL, it will be a horse of a different color. Then the local hounders (who will get a copy of her letter) will pay her a visit to "adjust her thinking". The bottom line being: DON'T QUESTION ANYTHING......
I wrote many letters and can honestly tell you that in some instances they do not even address the points raised in YOUR letter and are simply cowardly 'generic' type reply letters that will frustrate you because you will wonder if they even READ your letter. I actually felt they were too embarrassed or dishonest to address the issues raised in my letters and conveniently ignored them. Like BluesBrother said, the replies were also patronizing and I felt they insulted my intelligence.
This was one of my rude awakenings that began to make me see behind their facade and start to question the whole religion.
She may not want to bother. It's up to her.