Tansy, a word (or 300) of advice, if I may. It is quite likely you are simply wasting your time with 'the number'. JW's are among the hardest cultists to reach with the truth, not because they have it in spades, but because they are thoroughly indoctrinated in a belief system that exerts a powerful grip on them emotionally, psychologically and even physiologically.
It is the religious equivalent of crack cocaine, and it has its roots in an almost unshakeable conviction that they will soon be the inheritors of an earthly millennial kingdom in which they will enjoy pride of place over any other millennial residents. In fact, so deeply ingrained is this belief in their psyche that they were originally called Millennial Dawnists, after one of their publications.
The passage of well over a century since their adoption of this belief has not dimmed their hope in its eventual realization, and the idea that they might be wrong on this core doctrine of their system is just too horrendous to even contemplate. Most of them will tenaciously cling to it at almost any cost, even at the cost of disowning their own families. But belief in an earthly millennial kingdom is also widespread among evangelical Christians - just ask boarders like refreshed and rainy.
Unfortunately, that makes it almost impossible to put clear blue water between 719 and us, despite important doctrinal differences in other areas. As long as ground is conceded in the area that is most important to her, you might as well abandon any attempts to engage 719 in serious or meaningful debate.
There is only one area in which it may still be possible to make any impression, and that is to engage 719 in her understanding of the doctrine of salvation. As a relatively recent convert yourself, that probably requires a little more experience and knowledge than you currently possess.
Despite that, a good place to start is to ask 719 to recount her personal experience of how, exactly, she was saved. When, and how, and what did she do to earn it? And what assurance does she have that she is saved?
These are the most important questions that we need to put to her. Everything else is secondary, and just so much academic debate.