[Grover]

Originally Posted by Thomkal

Yeah I mean he could have told Carol, convinced her to stay in the hopes of finding a cure for her daughter, then told the others to leave because they were against keeping any of the Walkers in the barn alive.

I like this point, but I think Herschel knew that telling any single one of them would risk that person telling the rest of the group. We all know what happened when that became a reality.

I tend to agree with HB's point that Otis brought her in and was killed off before they had a chance to tell Herschel and Co that they were missing Sophia.