This story along with others that we read about, shows that we have to make sure that we leave nothing out when organising our affairs to do with the blood issue. If there is even the slightest chance that there could some loophole, it will get taken advantage of (which is understandable, for non Jehovah's Witnesses as it's a chance to make sure that their loved ones have the best opportunities to stay alive).
So, we have to go the extra mile by dotting all our i's and crossing all our t's, so as to not allow for any doubt in anybody's mind as to what our wishes are.
Even though there are signals that Tawnya is an active Witness, what with going out preaching and even the stand she made when having her child, there was still those niggling little uncertainties in the form of comments made from her relatives, not to mention the missing card. The point made that she hadn't been baptised has also been used against her in that people can call into question her commitment to the faith.