Well, it's a tricky situation but what if you offered to look over the new Blood card for her, do some research (Randy Watters has some wonderful information on the whole blood issue), draw diagrams for your mother if necessary and try to explain it to her in as simple as terms as possible. I would even try and approach the subject of this being "new light" (as insane as that quote is, it's something that Dubs can understand) and that obviously Jehovah would not hold it against her if she accepted "fractions".
I think they're counting on many of the R&F to find the whole thing "too confusing" and, as Scully said, it absolves them of any responsibility if someone dies, because they can say "hey----it was their decision, not ours". Rotten scumbags.