Welcome home! :dancing:
There are many, many threads on the subject of family members during the conversion process. You are not the first person to do this, nor will you be the last. You will find many converts and reverts right here on CAF.
There are also many, many threads on abusive family relationships. From what little you said, you might be in one. The current one started by
igator99 has the same advice I give all in abusive relationships, and their duties as adult children in such a relationship. So, if you can afford it, go get a copy of
God Help Me These People Are Driving Me Nuts! by Greg Popcak, and
Boundaries by Henry Cloud and John Townsend. You should be able to find
Boundaries in your local library.
I am a cradle Catholic, more or less. That said, I have a Lutheran sister, BIL, niece and nephew; several Baptist cousins; and more than my fair share of the non-denominational relatives.
I would suggest you pick your time and place to tell your mother carefully. In your case, because she is already abusive to you, it might be a good idea to plan to tell her when you take her out for breakfast or lunch, in a public place, where if she screams and yells, you have other people around to support you and to witness any abuse. It does not have to be now; in fact, depending on your circumstances, it would be a good idea to wait until you are well into the process of RCIA.
You might want to go over in your mind her objections, in case she asks real questions and doesn’t merely yell and scream. You might also be prepared for ultimate rejection.
I’ll be praying for you on your journey, and for your peace of mind.