Ask-a-Dave's-Gardener: Damaged Young Southern Magnolia, 1 by MeredithNJ

MeredithNJ wrote:
Hello. I had a small southern magnolia that I planted in my front yard two years ago. Last fall the deer in the area trampled it. I left the one stalk that was sticking out of the ground to see if it would grow back. When spring came there is a pod that looked like a leaf was going to grow off the one branch that was sticking out of the stalk. However that leaf just shriveled up and died. Now there are a bunch of leaves growing from the base of the stalk. My question is should I cut back the branch that had the dying leaves? Should I cut back the stalk any further? This tree was given to me to plant in memory of my dog and I would very much like to save it.