Who is Si Wang-mu from Children of the Mind and what is their importance?

Si Wang-mu was born into the serving class on the Chinese colony world of Path, Si Wang-mu was an anomaly in that she had all the genetic enhancements of the ruling class, without the obsessive compulsive disorder inflicted on them by Starways Congress. Every bit as intellectual as her mistress Qing-jao, Wang-mu is instrumental in helping the Lusitanian scientists come to a deeper understanding of the descolada in order to contain and re-engineer the virus.