what should I say, when the colleague said "you are my hero"?
I had expedited the finished date for my colleague, and she said "thank you , you are my hero" in email.
what should I say?

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我觉得和与回答thank you 一样的。不用谢 You're welcome之类的。

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In an email - say "You're welcome!"

In person, if your colleague is a native English speaker, say "I am the wind beneath your wings" (it is a joking reference to a song called "Wind beneath my wings." - if you can, listen to it)  then laugh, then say "you're welcome."  If your colleague does not have a sense of humor, just say "you're welcome."

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I'd say something like, "You're not so bad yourself! Thanks."