GSRLUVER said:
Remember, "A La Cart," is set some time after, "Dead Doll." Ecklie probably suspected something as they were searching for Sara because of Grissom's heavy and emotional involvement. Then, he probably heard that Grissom was at Sara's side on the way to the hospital, and Grissom most likely spent most of his free time with Sara which would be a big, flashing sign for romantic relationship.
I don't think that any of the team would rat them out...I hope.
As for Catherine not having a reaction, I hope we may get to see that in the next episode since Sara won't be by Grissom's side.