Re the etiquette point ... I wouldn't say you were being a dick, but given that she wanted to bike together for 'moral support', it might have been an idea to stick with her for this first ride and then discuss her abilities/expectations once home.
Maybe you can tactfully suggest that she do some riding closer to home before tackling longer rides/hills. Let the mutual friend be her buddy until she's riding at a pace that all three of you can maintain.
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The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi
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