Not sure why so many people are keen on defending Jaina. She was incredibly short-sighted and naive to think Garrosh would just sit there and watch as she abuses her neutral status to ship Alliance forces to Kalimdor in order to fight the Horde.
I suppose it's legit for the Alliance to use Theramore to infiltrate and fight the Horde, but the Horde using Dalaran as a transportion device to fight the Alliance is totally off the table. You say she did the right thing, but all she did was to make herself a legitimate target for Garrosh, and thus she doomed everyone at Theramore. It was an act of idiocy.