Well then I'd have to say yes, it might be a little bit too much for a young female racer. When taken into the full context of parameters, your essentially stacking a lot of cards against her: rotating mass, acceleration, moment of inertia, a young female's lack of power output, bike vs rider weight combo, etc.. All that said, if the bikes fits her properly then I'd say let her go at it and see how much fun she has with the events. If she takes to it all, then you might try sourcing a lighter weight wheel set and a lighter set of tires for racing.
The one place I think its very appropriate to be a weight weenie is with kids/youth bikes. When you factor in the ratio of bike vs rider 1lb of weight savings can be notable. I.e. a 75 lb rider on a 25 lb bike is comparable to me at 165 lbs being on a 54 lb bike. Kids are just small, their body's are under-developed, and they can't put out the watts to move the proportional weight around efficiently.
But I will say that if she's having fun it REALLY DOESN"T MATTER.
Cheers,
CJB