So in response to "Oh, god!" you might respond, "Oh, you didn't want any of this kind!"
And behave appropriately (if you're the one offering the food, or if another staff member is) so that her message is "gotten."
You also might explore the topic by asking, or making observations, about the dislike. There are many possibilities for why someone would reject an offered food item--it didn't look good, she wasn't sure what it was, she doesn't like that food item or dislikes that type of preparation, etc. If you are well-attuned (sensitive to her openness), you can make use of opportunities to explore the person in front of you, using her own reaction & communication as a starting point.
It's more helpful if true connection (genuine interest in the person) is your primary reason for reaching out (rather than some "goal" of instructing or coaching.) But one thing that happens in those interactions is modeling expression.
at 6:28 PM on Sep. 21, 2013