At first I wondered why anyone would waste their time, but now I see you are trying to be kind.
I'll bet it wouldn't be too hard to direct the conversation to any number of irrelevant "side" topics and thus avoid any serious indoctrination.
If she wises up to your plan, though, it is possible that she will tell you you're not "making progress" and drop you.
Don't take it personally.
I like Rebel8's idea - you could "just happen" to be baking a coffee cake when she arrives, or you can ask her for her favorite recipe for Philintheblankhere, and then tell her you're not sure if you could make it yourself - could she help you? That might even be fun. Or you could work on Halloween costumes together. Wait... No, that won't work.