Ask her how she would feel and what she would do if you started "sharing" with her any literature, websites, etc. that describe your beliefs.
You already know the answer to this. She has been instructed to not even open such material. In to the trash it goes!
You also know her motivation: She's hoping against all evidence to the contrary, that you might somehow be swayed to return to the JWs. She wants this for you because she loves you and wants you to be spared at Armageddon™ so you can Live Forever In Paradise On Earth™.
However, by asking her how she would feel if you did the same sort of thing to her, you can open a conversation about how disrespected you feel when she does this. She knows your position, and yet continues to disregard your feelings of being disrespected and offence by sending you JW literature.
You could say something like, "Mom, I love you very much, and I respect your beliefs enough to resist the impulse to try to change your beliefs or even try to talk to you about what I believe. I know what the Witnesses teach - you taught me very well - and I would appreciate it if you would respect my informed decision and not try to change my mind about this. We can talk about anything else you like, and I would prefer to keep our relationship without the strain that discussions about religion create for both of us."
PS - to reply to a post, simply scroll down to the bottom of the page to the box under the words "Have your say ... " and type your response. Click on the Post Reply button and you're done.