求英语专业人士分析Her goal is to do what she wants to.还是 Her goal is

求英语专业人士分析Her goal is to do what she wants to.还是 Her goal is to do what she wants to.
Her goal is to do what she wants to.在一本书上看到的,但是觉得有点纠结,如果what=sth that 那这个宾语从句很明显要把do带出来,但是书上却没有do,