Chicken won’t go in coop

[Chickenman168496]

Hello, after losing one of my two chickens recently I added two more to my remaining one. I split the run in half and added another coop so they can get used to each other for a few weeks. No aggression towards each over through the chicken wire at all.
Everything going well until my original chicken decided to not go into its coop tonight, the new two have already gone into there’s but the old one is just sitting outside. Any ideas, thanks

 

[Sussex19]

For tonight I'd just put it in myself, and see what happens.
If you can watch what happens after you put it in side, that might give you a bit more of an idea of whats discouraging her.

 

[BarnyardChaos]

Maybe it's time to put her into the coop with the other ones.