S.W.
She wakes up and she's alone. So she calls out.
She's young and will grow out of it. But meanwhile it will drive you batty because you are sleep - deprived.
I wonder why kids don't go wake up their dads...well, because mom wakes up and takes care of them...
Since you have a new routine, it may take some time to adjust. My best wishes for your sanity and success.
S.