Laura hand sensed him before he knocked, but... From his reaction on the network she was wary about just opening the door before he announced his presence. Between the loss of Gabriel, her overdue pregnancy, and now Robin... It was hard not to have dark thoughts.
If she knew what would happen to her children she would walk through the gate, and simply not return when the warning was given. There was no reason for her to stay. Except for her children.
Stroking over the top of Logan's head she stood and moved to the door. Opening it without word, beckoning him in. "Would you like to be alone with him?"