帮个忙谢谢~~

Not realizing who she was,the assistant was eager to serve her this time(发new concept)这儿动名词做句首有什么含义吗+？

not realizing who she was, 这是一个否定的现在分词结构，做状语，who she was是realizing的宾语从句
后面才是句子的主要部分：
the assistant was eager to serve her this time