So, I had her read your post, Anthony... so she'd know what to look for when out riding. And then we went out tonight for a 12 mile ride, and I noticed she was correctly riding on the hoods most of the time, and the rest she was in the corners... and I said something about getting a new seat post, and she was like "You know... I don't think I need one... this feels great right here, since we moved that bolt to the back."
She still doesn't want to let go of the handlebars to shift, but there's (sort-of) good news on that front... my Trek died. Derailleur hanger (non-replaceable) gave up the ghost on our ride last night, and so I cannibalized the Trek for parts to build up my Nashbar Touring in time for the Wednesday night ride. It's now a flat-bar commuter, and that means the Sora shifters are going to the little lady's bike. That should get her shifting more often instead of just riding the whole time in the lowest gear on the bike.