I had one like that too! Then I took her to the vet. She had tonsilitis.
(I'm not suggesting that yours has tonsilitis!!) After she got all better, she didn't bark for a few days. Then all of a sudden, she barked!!
I think she scared herself!! Then she barked again,
and again,
and again,
and she hasn't shut up since. :zip:
So....savor each day. You'll miss it soon enough!
Suz