The principal has posted a "school improvement plan" which states they will meet 100% of student's personal growth goals in NWEA reading and math prominently on the school's home page.
To prepare for advocacy, you may wish to print the statement from the school's home page (before it is changed, updated, or removed). You may wish to gather evidence of your daughter's fall score (220), winter score (221), and spring target (230). Having these source documents in hand, you may wish to meet with the principal and review these documents. Calmly ask what strategies are in place for helping your daughter achieve a 9-point gain in her score. Listen to his thoughts, ask gently probing questions to clarify, and be prepared to offer solutions if needed. Document the meeting including agreements reached, action plans, next steps. There is great advocacy information in the Davidson
Guidebook.
Another option may be after-schooling your daughter if this subject is of great interest and she would find it to be fun to learn more about math on her own free time.
If the overall school environment becomes toxic and not conducive to learning, you may wish to consider other educational options (acceleration, change to a different classroom, change to a different school, partial homeschooling, homeschooling, etc) to support your child.