What if she tests much lower than you thought. While siblings are usually close in IQ it is a 70% within x not an absolute. Mine tested a full standard deviation apart which if my first had was HG would have made my younger MG or below. Bright but not enough for early entrance. If you pay for the second half of the year and agree to her testing in to first grade it seems reasonable but they may take some persuading. Also it may just be a temporary problem that the teacher can solve.