Is that her typical way of dealing with feelings? To kind of shut down and need time and space? If so, I'd say just try and wait it out. When she's ready to talk, you can explain your feelings to her.
I have a hard time with this, myself. I tend to want to get things quickly smoothed over, and get frustrated by people who need more time/space to cool down. I like to talk about things right away rather than let them simmer.
Good luck, I'm sure she'll come around.