请问这句话中that作什么成分?引导的是什么从句?

宾语从句你把made up her mind 换成decided就明白了就是引导词 不充当句子成分 换成decided一定是宾语从句的
你可以到百度百科宾语从句中看一下
“ 二、动词的宾语从句”
“大多数动词都可以带宾语从句
We all expect that they will win , for members of their team are stronger.
我们都预料他们会赢,因为他们的队员更强壮.
He told us that they would help us though the whole work.
他告诉我们在整个工作中,他都会帮忙的.
部分“动词+副词”结构也可以带宾语从句
I have found out that all the tickets for the concert have been sold out.
我发现这场音乐会的所有票都卖光了.
Can you work out how much we will spend during the trip?
你能计算出这次旅行我们将花费多少钱吗?
动词短语也可以带宾语从句
常见的这些词有:
make sure确保 make up one’s mind下决心 keep in mind牢记
Make sure that there are no mistakes in your papers before you turn them in.
在上交试卷前确保没有任何错误.”
重点看最后一段“动词短语带宾语从句”
至于楼上把that引导的从句看做是在修饰mind这一个单词好像也有道理
看你怎么理解但我觉得 make up one’s mind和 I have a mind that这种普通搭配毕竟不同make up one’s mind这种固定搭配短语最好还是不要把每个单词拆开来看