Think of it this way (see if it helps): 

对  ____ 来说 means, to think from ____'s perspective 

So, in your case, 

对她来说那件事情很麻烦

From her perspective, this issue is troublesome (or your translation, "it is a troublesome situation"). 

So, your "for her" works as well. 

“对她来说”的问题

我还不了解“对她来说”。比如：对她来说那件事情很麻烦。意思是什么？

According to her, it's a troublesome situation.

或者

For her, it's a troublesome situation.

上面的句子描述她的问题或者表达她的看法吗？

谢谢你们！

“对她来说” can be translated as "in her view", "according to her angle" etc.