Yes! It's worth it. It's also very scary because you no longer want to be hurt by your parent.
Here's my experience
http://www.jehovahs-witness.com/7/79128/1.ashx
http://www.jehovahs-witness.com/7/85571/1.ashx
Whatever you decide, you are the one who has to live with "it". I wish you the best and I hope you make it a point of visiting her. At least write a letter. One of the things I did was concentrate on the things my parents taught me, and the things I was grateful for that they did for me, including adopting me.
Hugs
Brenda