Hi
I have a daughter, same age (youngest year 8, 12), started track last sunner...we've been through the mill, "know it all coaches" who know nothing and are dangerous, nasty peers, thrust into competition...etc. I've trained her myself for 6 months after yanking her from club training. She's representing the club, county and region. Top 10 Wales 800 without any training, top 10 in Welsh inter-county CC races, etc. Aiming high for track this simmer (target 2:24 800, 5:00 1500). She's training intervals, tempos, reps, etc. for those targets just now and exceeding them. Did a Time Trial on the road few weeks ago, 5:55 mile/min pace on an undulating road in freezing temps.
I've read tons of literature since last summer. Coe, Lydiard, Daniels. I actively seek advice from everyone knowledgeable and experienced. I sift, compare, talk to my daughter (I have 3 kids actually, all running--the other 2 are 10 and 8), and decide what's best. All 3 kids are constantly improving. 12yr old is racing CC the next 3 weekends--club, Welsh National CC, Welsh National Schools CC--then UK Inter counties in March at Birmingham. All WE want is for her to give her all. She doesn't train specifically for CC, but doing OK.
I have no problem sharing data, training programs, and passing on what I'd suggest you avoid--e.g., I would read, research, ask, and discard everything from the self-professed guru's. Do not doubt your own ability to know what is best for your daughter. You will always know her better than virtually any coach--that relationship is hugely valuable. BUT DOING IT THIS WAY IS A LOT OF WORK!!!
Your post reminded me of something from Arthur Lydiard, one of the acknowledged greats of coaching: "I never asked to coach a runner, they asked me." Just a caution.
Message me here or email me if you want to discuss any of the above.