Before you make a decision on just how to go about it, please ask yourself this question. If you were driving home from work and saw a terrible accident and heard a child screaming for help, would you worry most about which exit to take on the highway to get home quicker?
Do this what I tell you please and let nature take its course.
Next study, tell her that you have a seroius question about blood. Say that you need help understanding where these "allowable fractions" come from since blood is to be poured out. (Leviticus)
Show your research.
Talk about the blood drive at work and how you appreciate all your co-workers donating blood so that your new JW friends can get their life saving therapies.
You will see a pair of eyes open wide. Perhaps her mind may open also.
And maybe you will have helped that screaming child in that wreck.