I agree it is not a stupid idea but sounds like something to not worry about for now. have her buy a comfortable bike and get into riding. then when she wants to go farther and faster either make changes to what she buys or keep it for a run about and get a road bike.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk