Welcome OLK, I went through a similar process. The worst part was to find out that people, who I thought were my friends, didn't care about me. I stopped cold turkey after 15 years of full activity, and the only calls I got were from the BS conductor inquiring about my FS hours for the month. It took me another 7 years to fully stop believing that JW have the Truth. Finally now, I live happily WT-free and love it.
I wish you all the best on your journey and hope you get there much faster than I did.
As for your Mom, the only way she can live guilt-free and be happy is to prove to herself that what the WT teaches is NOT the truth.