No your bird is not considered tame at this point. A tame bird is a bird that is like a piece of velcro. The fact that she does not step up on command is an indication she is not fully trained.
I would suggest that when you are working with your bird try and offer your whole hand as a stepping area and not just a finger. To a bird fingers seem more threatening.
Some on this forum are advocates of perch training first. Using a wood perch or dowel to teach the step up command.
The reason your bird returns to the cage is for security and your bird does not feel safe out in the open because the trust level is not at that point with you yet.