I commend you, MMPC, on your efforts. Work with her and don't drop her. Keep the communication up if you are doing street riding (we're going to take a left at the next light), so she knows what to expect. Keep it fun and every one will be happy. I myself find tandems irritating if one is the stoker and the pair is very unevently matched. It's just boring, eh?
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Higher ground for the apocalypse!