Weeping Cherry Tree - Not Doing Well 2019

The last time I posted about this Weeping Cherry tree in the far reaches of our yard was back in April when I showed the buds that had set the previous Fall.  Today, it is struggling.  Not dead yet, but on the way to being put on the "LOST" list.  You can see a few green leaves on some of the limbs, but most of them are bare.  Some of the limbs have dried leaves on them.  Perhaps overwatered?  I'd be surprised if it was because the tree didn't get enough water.  Polar Vortex, maybe?  Not sure.

This was one of our Earth Day Trees from 2018 and it seemed to be doing just fine last year.  However, it *did* have a shoot come off of the trunk - below the graft - that I thought was an indication of a totally healthy tree.  However, now... in retrospect, it might have been a sign that the tree was struggling for life and it sent out the shoot to ensure that it has enough energy to survive.