Should I be worried?

[Megismeg]

I recently got a 10 week old pullet. I introduced her to my flock and kept a really good eye on her the first day. There was a little bit of pecking, but otherwise nothing too crazy. She did seem a little timid as my other chickens are about four months old.

Today I noticed that she wouldn’t come out of the coop and stayed in kind of the same spot all day. Her wings were kind of puffed out, but I assume that’s because I live in Texas and it’s pretty warm. But I haven’t seen her come out of the coop to eat or drink. I brought her inside to keep an eye on her and see how she acts away from the others, but I don’t know if her behavior is from heat stress, or from some sort of respiratory distress. Videos attached below for you all to see.
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[Eggcessive]

I cannot see the videos.

 

[Megismeg]

I cannot see the videos.

View media item 7972289
View media item 7972290
View media item 7972292Does this work?

 

[Megismeg]

I cannot see the videos.

I uploaded them under the gallery thing too.

 

[Megismeg]

Disregard. She just passed.

 

[Anon112]

I'm so sorry for your loss! You'll want to keep an eye on your other birds to make sure it wasn't something contagious.

 

[BigBlueHen53]

Upload videos to YouTube or Vimeo and post the links here.

 

[BigBlueHen53]

Where did you get this pullet? For future reference, it's a good idea to quarantine new birds for a month, to be sure they are not sick and do not bring lice, mites or fleas into your carefully tended flock. There are articles here on quarantining. Then once the quarantine is over, read articles on integration. It's almost always better, easier, safer to integrate at least two or three new birds into an existing flock than just one. Sorry for your loss, best wishes going foward.