be interested in疑问句要不要改陈述句语序

问题描述:

be interested in疑问句要不要改陈述句语序
我的意思是be interested in的是一个问句。比如说:I’m interested in how many books he had read还是I’m interested in how many books had he read

不要
She is interested in reading books.
Is she interested in reading books?