Don't get too stressed yet. The love bombing wears off after going to a few meeting and something or someone will piss her off again and she'll stop going again.
I know for us, we tried the fade but ended up just stop going completely about 8 months ago. We get the urge sometimes to go to a meeting after running into some of the nicer ones we miss. Then sure enough will run into someone who once again reminds us why we never want to set foot in the KH again. It's a tough situation to be in, I know:( It's gets pretty lonely when your starting all over.
I've had the same conversations with my mother through tears. I just try to tell her that I'm sorry she hurts because she feels that if the big "A" comes next week we will be destroyed, but I just don't feel that way anymore. I then tell her how much I love Jehovah and Jesus and how I know they see our hearts and I'm completely okay with that. It usually calms her down enough to say that it's true that Jehovah reads our hearts and she knows we have a good reason for not trusting the elders anymore. We too agreed not to talk about spiritual matters anymore because it just gets us both upset.
I hope all goes well with your family and please know that you are not alone in what you are going through.