Some general suggestions, and some specifics. I'm thinking more along the lines of someone in your situation - dating a woman who is a mom, and not necessarily a Disney nut, so you'll want to have plenty to options of things to see or do that aren't all about the parks - as opposed to people who've gone often, or entire families. OR Disney nuts.
1: AKL is a great resort, truly unique. Even if she winds up not digging Disney, she'll never forget that resort. One potential drawback is, since they're about to open the DVC wing, it might be more crowded when you go than has been in the past. And you're not particularly close to any other resort. This means, if she's not digging the savannahs, enjoying nights (outside of your room of course) might involve leaving the Lodge, relying more on Disney transportation or, better still, a car of your own.
2: If you're concerned about how much she'll enjoy the Disney aspect of a Disney vacation, you may want to consider resorts in the Downtown Disney area. For instance, staying at Saratoga Springs or Port Orleans Riverside means staying at incredibly beautiful and well-maintained grounds. Great for long walks, boat rentals, PO-R even has carriage rides. They both have water launches to Downtown Disney (many buildings in Saratoga are even within walkign distance) which affords you many more shopping and dining options, a night at Cirque du Soleil, or even a movie matinee during a rainy day.
3: You may also want to consider the Epcot resorts. Over near Epcot, you have the Boardwalk, The Beach Club and the Yacht Club all within walking distance to each other, and walking/water-launch distance to Epcot, Disney Hollywood Studios, the Swan, the Dolphin (lovely resorts, AND less "Disney" than any of those others, which makes sense since theyr'e not techincally Disney resorts), Which means you're not only close to the most "adult/mature" of the Disney parks, you're also right there for the Boardwalk's dining and entertainment options, and all the other options contained in those resorts, from clam bakes at Beach Club to nightly karaoke at the Swan.
4: Finally, if your budget allows it, you may want to consider the Contemporary. It's definitely hard to forget you're in Disney when the Castle's within spitting distance (not an endorsement of spitting at the castle, BTW). But certainly less Disney-ish than the other Magic Kingdom resorts and in terms of amenities, aside from the dining options you have there, the boat rentals, etc, you're also on the monorail line, which affords you easy access to what the Polynesian & Grand Floridian has to offer (from the beaches and Ohanas at the Plly to the spa at GF). It also allows you monorail access to MK and Epcot, AND boat access to Wilderness Lodge and Fort Wilderness. If it turns out she's a sucker for the Disney magic, you're steeped in it staying there.
5: I know some people have suggested staying in PO-R or Coronado because it will afford you a longer stay. Now, I don't know how long the two of you have been dating, or if you've traveled before, but if this is a relatively new relationship, newer ain't necessarily better, and you might be better served leaving her wanting more (so you have a reason to return, soon). Even if you wind up staying at a moderate, do not necessarily take that as a cue to stay longer, unless you two seem to be a sure thing. Vacations can be wonderful, but they can also add some strain to a relationship, especially because you wind up spending damn near every second together, in closer quarters than you have even if you two live together, with no friends or family around to provide a break if you ever got on each others' nerves. I am SO not trying to jinx you, and I hope the trip is all you want it to be, just trying to provide a little tiny voice of reason. best of luck.
