It might be growing a new crown (feather). I got one about 6 months ago and the pervious owner had it for about a year. I took it home and it opened up nicely. after about a month it closed up (just like yours. It looked pinched at the end) and I noticed the feather floating around in the water. In about a couple of weeks, it opened back up and had a new feather. Give it time, it is not dead. If it doesnt open soon and you dont want it anymore let me know. i will try to trade you something for it.