When it comes to doubts and revelations about JW beliefs and doctrines, I think everyone has a silver bullet with their name on it. What I mean is that something that might rock you to your very core (like a silver bullet) may only be only of passing interest to someone else.
Normally I'd never recommend anything like this but exiting from a cult like religion without ruining your life takes strategy and cunning (reverse spiritual warfare) . If I were you, I'd stop talking to her about all of this until you've gotten yourself and this elder situation squared away without raising any red flags.
After some time has passed and you've been carrying on as you normally would have and saying nothing more about your doubts and what you've said to her so far has faded a bit in her memory, you could start complaining of health issues. For example, chest pains....anxiety...stomach pains etc. especially when preparing for meeting parts or just before you give them (don't over do it though) . After a time where you've canceled a part or a talk or have missed a meeting now and them, you could visit your doctor (just for a regular checkup of course) but come home and tell your wife that he thinks you've been under too much pressure and responsibility and could be getting an ulcer and having other stress related issues. He wanted to put you through a barrage of tests and give you anxiety medicine but you told him you're afraid to go down that road just yet. In lieu of medication, he recommends that you monitor the food you eat and severely reduce the level of stress and responsibility you're currently carrying. Tell her that he told you to listen to the signals you're body is giving you before things get any worse. Tell her you're going to step down for awhile to see if things improve.
I don't like to advise anyone to be deceitful but sometimes the end justifies the means. You and your wife along with the rest of us have been deceived big time (you've even put off having a family for goodness sake). Our minds were bent so that we twisted our lives around those who lied to us and we've had to do whatever it takes to get untangled.
As someone else said, she may notice that she's not as special as she thought she was, now that you're not an elder. Subtly mention once in awhile that you've noticed that people are treating you differently...they seem cool and distant etc. and it bothers you that people are putting too much emphasis on position and are looking up to men too much.
What got the ball rolling for me was when a strong well meaning JW friend forwarded me an email about Beth Sarim thinking it was really interesting and was proof of how much the organization had progressed. I on the other hand was blown away that I, a former Bethelite, had never heard about this. For me, Beth Sarim was the "silver bullet "with my name on it. I was shocked and it gave me permission to allow myself to search the internet for other things I didn't know about my religion but should have.
Watch your wife's reactions to certain topics. Look for that "silver bullet" and try to figure out what her area of concerns are, be it the blood issue or child molesters or use of the contributions or flip flops on doctrines. Act as if you are genuinely researching these things (which you are) and need her to explain her take on them, to you . I did this with my wife. Rather than putting her on the spot, I acted as if I needed her help in clarifying things. In the process of her explaining her beliefs to me, she too woke up. If I'd have been confrontational or started showing her the glaring inconsistencies in the beliefs, she may have run the other way.
Remember, she thinks you are a "fully in" "spiritually unmovable" elder....yet you have woken up. She too may be less firmly entrenched than you think she is. I've found that many JW's are repeating their lines and moving as directed, each one thinking that the other is fully convinced and that they're the only one who's having doubts. The truth of the matter is that, most are only one or two pieces of new evidence, presented to them in the right manner, from waking up themselves. On some level they know this and it frightens them terribly. You must tread lightly...this is not an emergency.