In case it helps to run through a checklist, here's a link to common core 4th grade math.
The 5th and 6th grade math can also be found from the linked webpage.

BTW, some may say that for a child who is being grade-accelerated at a critical juncture, the placement in high math could be a foregone conclusion, without need for going through the regular route to qualify. This would be based on the federal definition of gifted, as read from the NAGC website:
"The term ‘gifted and talented,” when used with respect to students, children, or youth, means students, children, or youth who give evidence of high achievement capability in such areas as intellectual, creative, artistic, or leadership capacity, or in specific academic fields, and who need services or activities not ordinarily provided by the school in order to fully develop those capabilities."
Her alternative path to high math placement may be a service not ordinarily provided by the school.