I think you should stick to the facts of why you wish you were not raised JW.
And I just had a thought...
...maybe you could mention to her that it is accepted in the Org that 80% of the children raised in it leave.
Is she really ready for the 80% chance that she will have to shun her child in the future? Maybe ask her why 80% leave? Are 80% of children BAD?? How can that be? Maybe she thinks it is GREAT being raised a JW and she doesn't believe you, but maybe she should ask the other zillion people who were raised JW and hated it because it totally messed up their lives.