If you are currently having problems holding this snake at its current size..........Draping it around your neck is not a smart move at all. I know people do it.........I even do it at times......But, it isn't really the smartest thing to do. When I have my large snakes around my neck I will generally use certain "blocks" so I am never in a circumstance where I could get choked out.
But, if you do not feel comfortable handling a snake at that size.......I again, would not carry it around in that fashion. Generally, you should hold/support the bulk of the snake with one arm while controlling its movement with the other. Generally what will happen is a snake will "grab" you with it's tail for support and cling with it's body. You will use this area to support the snake. The other arm is basically for controlling the snake. ie. where it goes...........Or, away from your face.
If this snake has indeed been undernourished/just had babies. "Powerfeeding" it to make it "healthy" isn't the best idea in my mind. Slow and stady will win the race. Feed it adequate meals that can be digested and allow handling. At that size I generally feed my animals every two weeks.
I am bringing this up for a reason. If you are not comfortable with handling a snake that is that large....It is better to get right on it. This gives both you and her time to get adjusted to one another. Feeding it, which will bring more length and girth will only make the task more difficult. I am not saying not to bring her weight back up. What I am saying is bring it back slowly. She will better metabolize her meals and also get some exercise on top of that.
Hope this helps.
John
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"To be the best..........You must lose your mind."