Send her flowers for no reason other than to say "I love You Mom". If your Mom has a wedding anniversary send a card and flowers with Note I Love You Both. Don't overdo it but still feel free to express love, regardless of the rejection. You might be surprised it will make you feel good because you are expressing love with out conditions and it just may tug at her heart.
I agree with Sheri. Don't let some rule from a cult change who YOU are. Show her you still love her, maybe that will help her. It's no loss if it doesn't help, because you aren't communicating now.