I think you are more intelligent than you give yourself credit for .... you are intelligent enough to see through their smoke. It is just that it is impossible to reason with someone who can only repeat lines from WT publications. They are like recordings ... and the recordings are distributed to all of the congregations because my mother says the same garbage ... verbatim! Or at least she did ... we don't discuss it anymore. Do these sound familiar?
"It's not like this in all congregations."
"Jehovah's organization is run by imperfect men."
"We have to wait on Jehovah to clean his own household."
"It doesn't matter, it's still the truth."
There are a lot of wise people on here who can probably give you some good things to say to her, but my experience has been that it will not matter. It is like talking to a brick wall. You cannot reason with the unreasonable.
I think it is admirable that you do not wish to have your kids grow up in the same lie that you grew up in. It is hard to shake the guilt with family throwing the same old tired JW lines at you, but eventually it loses its effectiveness and she will stop trying.