she's definately old enough, but oh that poor momma.....
i feel your pain though, when we moved down to TX last year, we went from having all our rooms upstairs to now having ours downstairs and the kids all upstairs... they are 7 1/2, 7 1/2 and 4 and I STILL worry about them being so "far" at night!
It's a mother's job to worry i suppose....
you'll both be okay though!
oxox