Since a farcaster was used for encryption, they won't have a copy of her ego - the quantum cryptography is unbreakable. The rules clearly state that you can't block neutrino communications, and I believe this is the intent. Jamming doesn't exactly block the communications signals themselves, rather it puts out so many signals a receiver can't pick out the signal from the jamming noise. I don't see why you couldn't, with a sufficiently powerful neutrino jammer, put out so many neutrinoes that the receiver couldn't tell them apart. If there's a good scientific explanation for why you can or can't jam a neutrino signal this way, but I believe it is clearly not supposed to be possible. Bottom line is, if you as a GM want the signal to be jammed, but you should come up with a very good, one shot mechanism for it (experimental/TITAN/alien tech, unusually large power sources, the alignment was just so, etc.). If you don't want to stretch things for this encounter, then the criminal succesfully egocasted out.