我想用it is that强调for me.She will do something for me.

我觉得不是for的位置问题,语法上没有错的,就是这样放
而是句子本身的表达问题
She can do everything for me.为了我,她会做任何事
原句子好像没有意义的感觉
习惯上也不会这样说
所以改成
It's me that she can do everything for.
其他另外的例子的话
可以是
I went to the cinema yesterday.
It was yesterday that I went to the cinema.
She buys me a pet.
It's she that buys me a pet.
It's me that she buys a pet for.
It's a pet that she buys for me.