It's great that you are saved!
I would study my soul winning videos and memorize Scriptures to become a better soul winner, because sometimes it's more difficult to lead your own family to the Lord. I would also find a church like the one below in the link to attend. They have scheduled times through the week that you can go along as a silent partner with a more experienced one who has led many to Christ. He will do all of the talking, so it's easy and it's the best way to learn how to bless your own family.
That's tough when it's your own Mom.
I would fast and pray for her. She needs a soul winner like that or in the links to lead her to Christ. Unfortunately, the so called deliverance ministers I've heard didn't know the gospel. I've checked out many. Even if they cast out the demon, that would not solve the problem. It could return with more powerful devils.
I have a training video available that gives a soul winning demonstration. If you happen to have a similar
Church that actively wins people to Christ in your area, they would help you directly by visiting her and following through. That would be most effective. Check out the link and ask if you have questions. I used to attend a church like that and demon possession was an occurrence in the community. We'd go to cast them out and get the folks saved. I remember a group of college students who played a Ouija board and there was serious possession. They called the church and the pastor and his assistant showed up immediately. I followed up. The demons fled and some of the students trusted Christ as their Savior. Was that what you meant when you mentioned that board your Mom used?