You won't get any scriptures to refute what your mother has said, unless they are made up or misapplied.
Interesting observation. I've noticed that with some of the more esoteric doctrines, a refutation of JW beliefs using the Bible, would require that one jump into the pig-pen and roll around in the muck with them.
JW's don't just believe that heavenly events have rendered the world since 1914 unique, but that the 24 elders of Revalation picture an anointed class within the ranks of JW's, that the seven trumpets of Revelation were proclamations made at JW conventions, that the locusts of Revelation are JW's themselves, that the great crowd of Revelation are also a class within the ranks of JW's themselves, that Babylon of Revelation is all religions other than JW's, that opening of the seven seals of Revelation are events within JW history, even things as mundane as the installation of some new printing presses in the 1960's. It goes on and on and on.
What makes this sheer nonsense possible is not so much a matter of interpretation as it is a matter of one's attitude toward the Bible. In other words, the idea that 1st century Jewish apocalyptic is in any way relevant to us requires that one adopt the wildly egocentric attitude of 18th and 19th century Protestantism at its worst.
When challenged, JW's and those that think like them will demand alternative explanations for Revelation that fit this same mold. For example, you can deny that the 1st trumpet was sounded at a JW convention at Cedar Point, Ohio in 1921, but to really convince, you will have to provide some other event in the 20th century as an alternative.
It is not until one firmly believes, as the JW's do, that Revelation was really written to, for and about US, or at the very least, to, for and about OUR TIME that there is even anything to argue about. In the long run, it's probably better to stay out of the pig-sty altogether.