Hi Faithful Witness, Your news about your parents does not sound good. It does sound like your mother's cult persona is getting stronger.
What can you do to empower your mother's authentic persona? Is her authentic personal more emotional or logical? If she is going to retire soon, does she and your father have enough money to live the way they want to? I believe that there are a few articles on the internet that say most people run out of money before they die. Help your mother's authentic persona to grow stronger by helping her to remember what she use to think of before she was indoctrinated into the WTBTS.
It might be a good segue into helping your mother's authentic persona to question how close is close. If your mother uses the end is so soon thought-stopping platitude, just ask her simple questions about explaining the new WTBTS doctrines to you, why did/were the doctrines changed, and how many times have the doctrines been changed. Just appear perplexed by the WTBTS's doctrines and try to encourage your mother's authentic persona to do more (and independent) research. Didn't Jesus Christ warn his followers about false prophets in Mt 7:15-20?
Peace be with you and eveyrone, who you love,
Robert