I think she meant/imagines that JJ doesn't want her to go, and hopes she hurries back.Either that or she's killed him and is now wracked with remorse.
(
Captain Howdy,
Fri 8 Jun 2012, 10:26,
archived)
I think it means that they want JJ here to protect them as JJ "understands"
(
Michael Ellis contributes nothing,
Fri 8 Jun 2012, 10:41,
archived)