Greetings Holly:
An easy way to determine whether or not a branch, young seedling/sapling, or tree is still alive is to conduct the "scratch" test: take your finger nail and lightly scratch the thin, outer bark to reveal a cream or greenish color. If the scratch test fails to produce a cream or greenish color (i.e., it is brown or gray) beneath the thin outer layer of bark, then that portion of the tree/shrub is likely dead.
If the scratch test comes back positive (i.e., alive), then I would merely suggest waiting until late spring/early summer to see how the tree responds.
Be patient and play the wait and see game as there isn't anything you can do for this tree during the middle of dormancy :-)