Why is a Chinese empress known as lady of si-ling for?

There is no historical record of a Chinese empress known as the "Lady of Si-Ling". It's possible that this is a misremembered title or a fictional character.

To help me identify what you might be referring to, could you provide more context? For example:

* What dynasty are you thinking of?

* Is there any other information about her? (like her reign period, her husband, or any notable events associated with her)

* Where did you come across this information? (book, movie, etc.)

With more information, I might be able to help you find the empress you're looking for!