If my girl tells me that she is upset but doesn’t say why I made her upset, what’s the best way to react?

DavidFox
Some may say apologize, but if I don’t know why she is upset what would I apologize for? Some may say let her cool down but isn’t that not reacting at all. Girls when you let a guy know you are upset, he should do what?
Updates:
4 d
Thank you everyone for your advice. I did wait for her to follow up and ultimately it got worked out.
If my girl tells me that she is upset but doesn’t say why I made her upset, what’s the best way to react?
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