She knows that she can't tell the rest of the team the truth about her, because there's already one too many people that do. It hurts to keep a secret from them because for the first time she has someone to tell, but she knows that A.C. is right when he tells her it's not a good idea.
Instead she smiles when Ward asks her if she's alright, trying not to sound concerned (but she always knows), and FitzSimmons try to cook dinner to cheer her up and end up setting the kitchen on fire.
And really, she is, because she knows that even when she tells them the truth they won't treat her any differently.
(But in the meantime, FitzSimmons are banned from the kitchen, particularly at the same time.)