Help with a Baby silkie chick

[Daisyd08]

My broody hen was sitting on some eggs that didn't hatch so I got some baby chicks. Born June 27th. One of them did not look well from the first day we got it. It wasn't moving much/ drinking or eating. I gave it some sugar water and cooked egg yolk and it took it. Fast forward it still alive but everyday I am cleaning it for pasty butt. It is smaller than the other two. Picture of the little baby. First time raising chicks. Not sure if there is anything more I can do to help it but open to any ideas.
Thank you

 

[The Coop Crew]

You may have to clean her butt several times. How is her poop?

 

[Daisyd08]

I wouldn't say it's anything out of the ordinary.

 

[The Coop Crew]

I wouldn't say it's anything out of the ordinary.

Is the brooder box too warm? I think I read that that can cause recurrent pasty butt.
Sorry I’m fairly new myself and I’m going based off of things I’ve read!