Wantmomback: First if all, I love your alias; it totally describes how I feel. There's a couple of things I would like you to consider, and forgive me if they seem a bit redundant.
Taking the responsibility of getting your mom out of the watchtower is an enormous undertaking. Before you do so, first and foremost, you have to be absolutely sure that they are 100 percent wrong. This means you can't have any lingering loyalty to the WTS or its teachings, otherwise how can you maintain a conversation with your mom? Remember, JW's are trained to sniff out the weakness in the person, so make sure you do your research so you know what your saying and can anticipate what she will say. That way you will be in control of the conversation.
Second, do not, I repeat, DO NOT attempt to do this on your own. If you have relatives who don't believe you, and know nothing about the WTS, you have to convince them also. I know this seems like alot of work, but it will be well worth it. Make them well aware of the severity of the situation; your mother is in very real danger. Trust me; you don't want to be fighting your mother's WTS mentality and the indifference of your relatives at the same time. This will help you later down the line when you want to stage an intervention. You can read more about this in Combatting Cult Mind Control by Steve Hassan. I suggest you buy it.
Third, and this is more ambiguous, make sure that you are offering her a better alternative to her situation now. You see, it's not enough that you know this is a false religion, you must also know what is the true religion. And nothing can be more true than being yourself. Find out who you are first, and what you want before you attempt to do that for her. If she sees you as nothing more than a miserable "worldly" person, she will NEVER listen to you. Don't wait for her to put 2 and 2 together. You might be depressed and sad because she won't listen, not because of anything you're doing wrong. After all, one can't accept the truth without rejecting the lies, and you can't open one door without closing another behind you.
She may on some level know this is all a lie, but she doesn't necessarily know the truth. That's where you come in. Show her that your love is unconditional and that you will always be there for her. I know it's exhausting, but if your situation were reversed, would you want her to give up on you?
Finally, and this is the most important of all, take it one day at a time. Remember, you have your own life to live. I'd like to say never give up, but I don't want you to go insane in the process. In the end, it's really up to her. When all is said and done, you'll want more than anything to say that you tried your best, and you can't do anything more. The results are not as important as the struggle itself.
I'm sorry for talking down to you, you're probably a mature adult and can figure all this out on your own. I mean you no disrespect at all, and I don't mean to preach or lecture to you. It's just that I'm in a similar situation as you, and I wish someone had told me this a long time ago.
Good luck with everything and God Bless,
Anitar