Friel for conventional, practical training advice. Obree for some inspiring left field alternative thinking, but not so practical for most of us (the chapter on his multi-phase breathing technique is a cracker…). I found Obree’s book interesting, but without some training experience I think it might be difficult to know which bits to take with a pinch of salt.
It might be more effective to hook up with a good local club that offers appropriate coaching, instead of reading a manual. At your daughter’s age I think it should be about keeping things interesting and trying to include a few key training principals, rather than trying to follow a systematic programme too closely. A good coach can help pick out the most useful stuff from a Friel-type programme without trying to apply the whole lot. Your daughter might also benefit from being in a team with her peers, which will also be more interesting than racing solo.