Which grade do you intend to put her in? Maybe start her in 10th or 9th would do this year as last year she was above average for 8th grade test, but bear in mind that "above average" does not necessarily mean as great as what some may think. 75th percentile in the class is the upper quartile but not necessarily the top. I was 98th-99th in grade level before they let me skip and for me 1 skip was enough to get into a very top university afterwards.
I agree with that and that is a reason why I would prefer labelling - if only to have a report stating that her skills are way above average and therefore to accommodate her. At least that's the official paper to support you in case there are any conflict or worse - legal matters (imagine discrimination against 2e).
My opinion is to report her as grade 10... but it depends on that 8th grade test to be fair. I would prefer AP rather than CLEP for international transfer and standardised benchmarks. I'm OK with her in in person campus at 15-16 full time starting off with AP credit. My concern is more to do with any potential age discrimination and harassment rather than any capability issue - if you do so perhaps have a lawyer on call in case there is serious age discrimination from the university.
I think the best would be to have a good amount of hobbies, CLEP/AP and then go to university in-person at 15/16 that is what I would do. Even if she goes a little bit wild I am more concerned about others' reactions to her (which we could fix with mediation or legal action) rather than her own capabilities.
