How many levels does the calligraphy of filial daughter Cao E have?

Filial daughter Cao e tablet calligraphy level 9. The Monument to the Filial Daughter Cao E is no less than Preface to Lanting, the first running script in the world. The Monument to the Filial Daughter Cao E is Wang Xizhi's last calligraphy work in lower case. It was written for a woman and praised her filial piety. Three years after Wang Xizhi finished this work, Wang Xizhi died. This work became Wang Xizhi's last little letter about filial piety. It is extremely difficult, and it belongs to the high level of 7-9 in calligraphy and other exams.