A:It is not permissible for her to move out, irrespective of her age. She has to compulsorily complete the Iddat without moving. Seeing her children is not a valid reason for her to leave the Iddat house. The children can visit her.
If a woman observing iddat is in real danger of losing life or limb, or she suffers from acute fear when alone, then she may leave her home and stay in a safer place. (Fataawa Hindiyyah V1 P535, Aljauharatun Nayyirah V4 P310).
She cannot leave for any other reason.
Moulana Yusuf Laher