JEBUS!!! Touchy, touchy, Don!
IMO, the best two books out there are Nick Ienatsch's "Sport Riding Techniques" and Lee Parks' "Total Control", in that order. But I'm afraid that both are too advanced and would simply overload her with too much information at the stage you're asking about. I started riding at 13 and skiing at 2, so I just don't have many specific recollections about learning either, but I have seen lots of boyfriends and husbands ruin a woman's experience and fun (on skis), sometimes even demonstrating that he doesn't know what he's doing skiing OR teaching. Hopefully, you recognize that pitfall and religiously avoid it. I've been an expert skier for a long time, and while I've taught a couple ski instructor friends some advanced stuff, I don't know anything about teaching beginning skiers and wouldn't even be close to their equal in doing that. Just saying I'd rethink teaching her on the bike stuff before she takes the MSF course, especially in light of what MEM noted above about class availability.
Sorry I don't have any level appropriate reading or technical riding suggestions, but I have a few practical ones once she has the basic stuff of the MSF class under her belt. Suggest that she ask her MSF instructor at the end of the class about how to progress from there and what to practice after she passes the course. Beyond that, I would stress developing awareness of everything around her, and that skill can be practiced anywhere. Tell her it's absolutely OK and highly encouraged that if she is tired, hungry or (especially) dehydrated, that she stop and address those issues. This is an activity that gets dangerous if you let your body down, and don't let her feel that she EVER needs to keep up or ride outside her comfort zone.
If you haven't read the two books I suggested, do so. Reason? Because both do a great job of stressing (and Ienatsch recommends drills for) the number one survival and control skill -- training your eyes. You can help her with that when she drives her car -- a great place to practice. Then she can take it to the street on her bike when she can integrate that skill seamlessly. It's one thing to know about target fixation (MSF will tell her about that), and another to train yourself to reflexively LOOK AT the way out (not at the oncoming vehicle encroaching into your/her lane) or AT the roadway surface around the pothole (not at the pothole). You want to add something truly valuable? Then help her master that, because it's the number one skill for survival and she won't have time to learn it when something challenging occurs if she doesn't already own that skill reflexively.
As far as riding with her -- go slow if you're leading to show her the route or let her lead if she knows the route -- so that she isn't having to keep up with you and doesn't get locked into watching your bike instead of the road. Ride far enough away from her that she doesn't have to worry about reacting to your bike in her mirrors or stopping quickly in front of her. Teach her about staying right entering blind corners and generally about giving herself the most room to avoid possible hazards (moving or not). Teach her about the stuff Dr. Hurt told us statistically some 30 years ago about where stupid cager tricks are most likely to come from (primarily, the various left hand turns into us when they predictably don't see us) so that she can recognize a potential threat and take preliminary action to be in the best place and at the best speed to react with an evasive maneuver when a cager does that stupid trick.
Shepherd her away from traffic and technical stuff (i.e., twisties and roadways with gravel, sand, obstacles) so she gets used to controlling the motorcycle before those become further complications for her to have to address. I like the suggestion about parking lot practice of figure 8s, U-turns, etc. We can all use regular practice in slow speed stuff, and one skill she will learn there is feathering the throttle as she engages the clutch to take off from a standing start -- let her make that second nature before she has to use it at a crowded intersection.
If she's serious, she needs miles under her. Make it fun and set up regular rides that you plan out with her developing skill set in mind.
And aim her at full face helmets and truly protective gear. There's not much sexier than a fit woman in leathers on a sport bike (or a Virago) that she knows how to handle. It reeks of confidence, and there is nothing sexier than that. Good luck to her.
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