Sorry Ray .....just read your response. The delicate subject of whether to put her down as alive or deceased on our family tree! I’m thinking the latter as she hasn’t shown up on the electoral register since 2014. If I’m wrong, either way a relative somewhere may get a little upset.
You have her on your tree already, there's no need to seek to contact her to determine if she is still alive ... I don't see why you would conclude that just because you can no longer find someone on an electoral register in 2015, 16, 17, 18 that it follows that they are no longer living.
Just for a moment, consider reversing the role... Assume you were findable on the 2014 electoral roll but you moved, or you applied to be de-listed, or you failed to vote and were removed from the list etc ..... and a family history buff that that you have never met UNBEKNOWN to you had put your name on their private study records as though you were related to them .... and then because they could NOT find you in any online database from 2015 to now, they decided that meant that you were no longer living and so they then thought a bit more and decided it would be okay and they uploaded that private study record to a website showing your private/sensitive/personal identifying information to the global world ... showing your close relatives details, perhaps employment history, perhaps any medical history, school results, photos etc etc etc and ... while the info was about you, and you were offended and upset etc, you also knew that you were NOT actually related to the rest of the people on that tree ... the person had missed a vital clue ... the 2014 electoral roll person had MIGRATED to Australia...
JM ...