claim
- that she had made to the media
- that she said
- that she would not leave the band.

In the following sequence:
The singer made claims to the media.
In her claims she said she would not leave the band.
Then, she confirmed her claims.
把这三句合并，就得到上面那句。
其中claims涉及的内容一直延伸到句末。
如果没有she said，可以直接用that构成claims的同位语，但有了she said，用where其实等同于in which。

claim 的内容是 she would not leave the band，而不是 she said she would not leave the band，所以不是同位语从句。那么作为定从，它跟主句中的先行词 claim 有啥关系呢？她说，她在哪说的？在她的声明里说的啊。所以 claim 是定从“她说”这件事发生的地点，引导词用 where 或 in which。