Star Grinch wrote:
She implied she was on the Cube Locutus was using to attack Earth, then escaped using time travel. Plus the Collective apparently has the ability to open time portals on a whim as demonstrated in First Contact.
And what about the magic door they left in Earth orbit that temporally shielded ships, and could allow protagonists to chase the Borg into the past and route them before they even got a foot hold on their target?
Once you realize that the Queen could have time travelled back in Borg space where it was safe, the only feasible reason that she went all the way to Earth first was so that she could pick up her boyfriend first.